CPC Subgroup
E01F 5/005 Full Title
Draining the sub-base of roads or ballastway of railways by trenches, culverts, or conduits ( underground drainage E02D; conduits for sewerage E03F)
E01F 5/005 Draining the sub-base of roads or ballastway of railways by trenches, culverts, or conduits ( underground drainage E02D; conduits for sewerage E03F)