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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24/00
Mechanisms for selecting, projecting, retracting or locking writing units
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B43K24/10
for selecting, projecting and locking several writing units
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B43K24/14
operated by turning means
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B43K24/146
with cam control
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