DIFF Subgroup
B21D 28/04 Centering the work; Positioning the tools
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Shaping by press-cutting; Perforating > Punching blanks or articles with or without obtaining scrap; Notching > Centering the work; Positioning the tools
CPC:
Shaping by press-cutting; Perforating > Punching blanks or articles with or without obtaining scrap (cutting nails or pins from strips or sheet material B21G3/26); Notching > Centering the work; Positioning the tools
No child classifications to compare. This is a leaf node in both IPC and CPC.