Description
Class B23G : THREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH
Subclass 1/30: Thread cutting; Automatic machines specially designed therefor Manually-operated thread-cutting devices (features of the threading tool B23G 5/00) without means for adjusting the threading tool, e.g. with die-stocks (tap wrenches B25B)