DIFF Main Group
F21V 37/00 Details of lighting devices employing combustion as light source, not otherwise provided for
Introduced: September 1968
CPC subdivides this area 3x more granularly than IPC with 2 additional codes.
2 codes are CPC-only extensions.
IPC defines codes here since 2000.
Child Classifications
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- F21V 37/02 Special adaptation for protection against draughts since 2000 IPC+CPC Available in IPC and CPC