Patent classifications
B
PERFORMING OPERATIONS; TRANSPORTING
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B43
WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
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B43L
ARTICLES FOR WRITING OR DRAWING UPON;; WRITING OR DRAWING AIDS;; ACCESSORIES FOR WRITING OR DRAWING
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13/00
Drawing instruments, or writing or drawing appliances or accessories not otherwise provided for
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B43L13/02
Draughting machines or drawing devices for keeping parallelism
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B43L13/028
Hand held or associated with the writing instrument
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