B
PERFORMING OPERATIONS; TRANSPORTING
B
PERFORMING OPERATIONS; TRANSPORTING
B43
WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
B43
WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
B43K
IMPLEMENTS FOR WRITING OR DRAWING
B43K
IMPLEMENTS FOR WRITING OR DRAWING
5/00
Pens with ink reservoirs in holders, e.g. fountain-pens
5/00
Pens with ink reservoirs in holders, e.g. fountain-pens
B43K5/18
Arrangements for feeding the ink to the nibs
B43K5/18
Arrangements for feeding the ink to the nibs
B43K5/1818
Mechanical feeding means, e.g. valves; Pumps
B43K5/1818
Mechanical feeding means, e.g. valves; Pumps
B43K5/1827
Valves
B43K5/1827
Valves