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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B43K24/02
for locking a single writing unit in only fully projected or retracted positions
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B43K24/08
operated by push-buttons
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B43K24/084
with saw-like or analogous cams
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