UN PROCEDIMIENTO DE MOLDEAR TRAVIESAS DE VIA FERREA EN HORMIGËN CON ANILLAS EMBEBIDAS

摘要

913,090. Concrete sleepers. DOW-MAC (PRODUCTS) Ltd. May 11, 1961 [Dec. 7, 1960], No. 42067/60. Class 104 (2). [Also in Group V] A reinforced concrete sleeper has tempered steel hoops 6 with bridge parts 9, 10 which hold spring-plates 18. One end of each plate engages the base 19 of a rail with an interposed cushion 20.