Producing gear wheels or similar articles with grooves or projections, e.g. control knobs
16
/
00
Producing articles with corrugations (B 29 D 23/18 takes precedence) [4]
17
/
00
Producing carriers of records containing fine grooves or impressions, e.g. disc records for needle playback, cylinder records (recording sound or other information using formed grooves or the equivalent
G 11 B); Producing record discs from master stencils [4,6]
19
/
00
Producing buttons or semi-finished parts of buttons
19
/
04
•
by cutting, milling, turning, stamping, or perforating moulded parts; Surface treatment of buttons
19
/
06
•
•
Devices for feeding semi-finished parts to the processing machines
19
/
08
•
•
Making holes in buttons or in semi-finished parts thereof
21
/
00
Producing hair combs or similar toothed or slotted articles
21
/
04
•
by sawing, milling, cutting, or similar operations