DIFF Subgroup
E01B 7/22 Special sleepers for switches or crossings; Fastening means therefor
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Switches; Crossings > Special sleepers for switches or crossings; Fastening means therefor
CPC:
Switches; Crossings (operating mechanisms B61L) > Special sleepers for switches or crossings; Fastening means therefor
No child classifications to compare. This is a leaf node in both IPC and CPC.