Patents
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B43 - Writing or drawing implements; Bureau accessories
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B43L - Articles for writing or drawing upon; Accessories for writing or drawing
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B43L 3 - Writing or drawing-underlays, e.g. blotting pads
Patents for B43L 3 - Writing or drawing-underlays, e.g. blotting pads (601)
03/1976
03/16/1976
US3943647
Device for recording on and storage of information cards
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