DIFF Subgroup
G21K 1/02 using diaphragms, collimators
Introduced: July 1974
Full Title
Arrangements for handling particles or ionising radiation, e.g. focusing or moderating > using diaphragms, collimators
Of 2 combined children, 1 exist in both systems.
1 codes are CPC-only extensions.
IPC defines codes here since 1974.
Child Classifications
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- G21K 1/04 using variable diaphragms, shutters, choppers since 1974 +2 CPC IPC+CPC Available in IPC and CPC