CPC Subgroup
E01B 7/22 Special sleepers for switches or crossings; Fastening means therefor
Full Title
Switches; Crossings (operating mechanisms B61L) > Special sleepers for switches or crossings; Fastening means therefor
E01B 7/22 Switches; Crossings (operating mechanisms B61L) > Special sleepers for switches or crossings; Fastening means therefor