twist-drills; screw-taps

Introduced: September 1968

Title

Titles differ between systems:

IPC: twist-drills or screw-taps

CPC: twist-drills; screw-taps

Full Title

Full titles differ between systems:

IPC:

Making helical bodies or bodies having parts of helical shape > twist-drills or screw-taps

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) > twist-drills; screw-taps

No child classifications to compare. This is a leaf node in both IPC and CPC.