Patent classifications
B
PERFORMING OPERATIONS; TRANSPORTING
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B43
WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
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B43K
IMPLEMENTS FOR WRITING OR DRAWING
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8/00
Pens with writing-points other than nibs or balls
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B43K8/02
with writing-points comprising fibres, felt, or similar porous or capillary material
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B43K8/024
with writing-points comprising felt
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