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B43L 1/00
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Repeatedly-usable boards or tablets for writing or drawing |
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B43L 1/02
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Slates |
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B43L 1/04
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Blackboards |
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B43L 1/06
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Blackboards rigid |
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B43L 1/08
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Blackboards flexible |
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B43L 1/10
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Writing surfaces thereof |
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B43L 1/12
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Repeatedly-usable boards or tablets for writing or drawing having translucent writing surfaces producing visual impressions by co-operation with backing members |
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B43L 3/00
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Writing or drawing-underlays, e.g. blotting pads |
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B43L 5/00
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Drawing-boards |
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B43L 5/02
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Drawing-boards having means for clamping sheets of paper thereto |
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B43L 7/00
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Straightedges |
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B43L 7/02
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T-squares |
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B43L 7/04
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Straightedges with rollers |
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B43L 7/08
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Straightedges with arrangements for attaching additional drawing equipment, e.g. for hatching, dotting |
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B43L 7/10
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Plural straightedges relatively movable |
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B43L 7/12
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Square and pivoting straightedges |
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B43L 7/14
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Square and sliding straightedges |
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B43L 7/027
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Plural non-adjustable straightedges fixed at right angles |
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B43L 7/033
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Plural non-adjustable straightedges forming non-right angles |
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B43L 9/00
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Circular curve-drawing or like instruments |
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B43L 9/02
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Compasses |
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B43L 9/04
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Beam compasses |
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B43L 9/06
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Compasses with legs formed by flat springs |
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B43L 9/08
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Proportional compasses or dividers |
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B43L 9/10
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Proportional compasses or dividers with arrangements for drawing polygons |
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B43L 9/12
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Dividers |
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B43L 9/14
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Circular curve-drawing or like instruments with changeable leg-ends for conversion into compasses, dividers, or callipers |
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B43L 9/16
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Features common to compasses, dividers, or callipers |
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B43L 9/18
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Legs with toggle joints |
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B43L 9/20
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Pivots |
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B43L 9/22
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Leg-angle adjusting-means separate from pivots |
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B43L 9/24
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Means for mounting points or writing appliances on legs |
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B43L 11/00
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Non-circular-curve-drawing instruments |
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B43L 11/02
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Non-circular-curve-drawing instruments for drawing conic sections |
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B43L 11/04
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Non-circular-curve-drawing instruments for drawing conic sections for drawing ellipses |
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B43L 11/05
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Non-circular-curve-drawing instruments for drawing conic sections for drawing ellipses with gears |
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B43L 11/06
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Non-circular-curve-drawing instruments for drawing spirals |
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B43L 11/08
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Non-circular-curve-drawing instruments for drawing involutes |
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B43L 11/045
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Non-circular-curve-drawing instruments for drawing conic sections for drawing ellipses with cords or like flexible elements |
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B43L 11/055
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Non-circular-curve-drawing instruments for drawing conic sections for drawing ellipses with guides |
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B43L 12/00
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Means to prevent slippage |
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B43L 12/02
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Means to prevent slippage magnetic |
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B43L 13/00
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Drawing instruments, or writing or drawing appliances or accessories, not otherwise provided for |
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B43L 13/02
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Drafting machines or drawing devices for keeping parallelism |
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B43L 13/04
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Guides for rulers |
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B43L 13/06
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Guides for rulers with pivoted guide rods |
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B43L 13/08
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Protractor heads |
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B43L 13/10
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Pantographic instruments for copying, enlarging, or diminishing |
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B43L 13/12
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Multiple writing devices |
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B43L 13/14
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Devices for drawing in perspective |
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B43L 13/16
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Devices for drawing in perspective free-hand |
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B43L 13/18
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Devices for drawing in perspective free-hand having optical or projecting equipment |
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B43L 13/20
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Curve rulers or templets |
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B43L 13/22
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Adjustable curve rulers |
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B43L 13/24
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Devices for generating stepwise movements of drawing equipment, e.g. for hatching |
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B43L 15/00
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Supports for attachment to hands or arms for facilitating writing or drawing |
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B43L 17/00
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Blotters |
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B43L 17/02
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Blotters for blotting-paper sheets |
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B43L 17/04
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Blotters for blotting-paper sheets hand-held |
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B43L 17/06
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Blotters for reeled blotting-paper |
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B43L 17/08
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Roller blotters |
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B43L 17/10
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Blotters using blotting material other than paper |
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B43L 19/00
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Erasers, rubbers, or erasing devices; Holders therefor |
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B43L 19/02
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Erasing knives |
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B43L 19/04
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Fibrous erasers |
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B43L 21/00
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Blackboard or slate-cleaning devices |
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B43L 21/02
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Blackboard or slate-cleaning devices with means for absorbing the chalk dust |
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B43L 21/04
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Wiper holders |
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B43L 23/00
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Sharpeners for pencils or leads |
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B43L 23/02
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Sharpeners for pencils or leads with gearing |
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B43L 23/04
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Sharpeners for pencils or leads with gearing with cranked handles |
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B43L 23/06
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Sharpeners for pencils or leads in which the pencils or leads are sharpened by only axial movement against cutting blades |
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B43L 23/08
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Sharpeners for pencils or leads in which the pencils or leads are sharpened mainly by rotational movement against cutting blades |
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B43L 25/00
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Ink receptacles |
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B43L 25/02
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Ink receptacles with separate dipping-cups |
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B43L 25/04
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Ink receptacles with separate dipping-cups supplied by pressure arrangements |
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B43L 25/06
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Ink receptacles with separate dipping-cups supplied by tilting the receptacles |
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B43L 25/08
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Ink receptacles with arrangements for dissolving ink powder |
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B43L 25/10
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Ink receptacles with means for holding objects |
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B43L 25/12
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Ink receptacles with pen-wiping means |
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B43L 27/00
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Ink stands |
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B43L 27/02
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Ink stands having means for securing objects thereon |
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B43L 27/04
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Ink stands securable to other objects |
