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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5/00
Pens with ink reservoirs in holders, e.g. fountain-pens
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B43K5/18
Arrangements for feeding the ink to the nibs
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B43K5/1818
Mechanical feeding means, e.g. valves; Pumps
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