DIFF Subgroup
B21H 3/12 articles with helicoidal surface (bending strip or the like helically B21D11/06)
Introduced: September 1968
Title
Titles differ between systems:
IPC: articles with helicoidal surface
CPC: articles with helicoidal surface (bending strip or the like helically B21D11/06)
Full Title
Full titles differ between systems:
IPC:
Making helical bodies or bodies having parts of helical shape > articles with helicoidal surface
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) > articles with helicoidal surface (bending strip or the like helically B21D11/06)
No child classifications to compare. This is a leaf node in both IPC and CPC.