DIFF Subgroup
F21V 1/04 rigid (F21V1/08 takes precedence)
Introduced: September 1968
Title
Titles differ between systems:
IPC: rigid
CPC: rigid (F21V1/08 takes precedence)
Full Title
Full titles differ between systems:
IPC:
Shades for light sources > Frames > rigid
CPC:
Shades for light sources > Frames > rigid (F21V1/08 takes precedence)
No child classifications to compare. This is a leaf node in both IPC and CPC.