DIFF Subgroup
B21H 3/04 Making by means of profiled-rolls
Introduced: September 1968
Title
Titles differ between systems:
IPC: Making by means of profiled rolls
CPC: Making by means of profiled-rolls
Full Title
Full titles differ between systems:
IPC:
Making helical bodies or bodies having parts of helical shape > external screw-threads > Making by means of profiled rolls
CPC:
Making helical bodies or bodies having parts of helical shape (helical gears B21H5/00; forming tubes or tube walls into helical shape B21D11/06, B21D15/04) > external screw-threads > Making by means of profiled-rolls
Of 1 combined children, 0 exist in both systems.
1 codes are CPC-only extensions.
Child Classifications
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