DIFF Main Group
F28D 21/00 Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
Introduced: September 1968
Title
Titles differ between systems:
IPC: Heat-exchange apparatus not covered by any of the groups
CPC: Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
Full Title
Full titles differ between systems:
IPC:
Heat-exchange apparatus not covered by any of the groups
CPC:
Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
Of 4 combined children, 0 exist in both systems.
4 codes are CPC-only extensions.
Note: 1 CPC extensions are marked as secondary classification only.
Child Classifications
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