DIFF Subgroup
E01B 7/28 Crossings
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Switches; Crossings > Crossings
CPC:
Switches; Crossings (operating mechanisms B61L) > Crossings
IPC and CPC are identically structured here. All 1 subcodes exist in both systems.
Child Classifications
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