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Publication of FR552517ApublicationCriticalpatent/FR552517A/en
E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
E01B3/00—Transverse or longitudinal sleepers; Other means resting directly on the ballastway for supporting rails
E01B3/28—Transverse or longitudinal sleepers; Other means resting directly on the ballastway for supporting rails made from concrete or from natural or artificial stone
E01B3/36—Composite sleepers
FR552517D1922-04-081922-06-03
Reinforced concrete railway sleeper with wooden pads under the rails
ExpiredFR552517A
(en)