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Priority claimed from DEST46246Dexternal-prioritypatent/DE511864C/en
Application filed by Sternberg Traffic Automaten CofiledCriticalSternberg Traffic Automaten Co
Application grantedgrantedCritical
Publication of DK44230CpublicationCriticalpatent/DK44230C/en
DK44230D1929-08-081930-08-06
Device for switching on Traffic signals at street intersections using Two sleepers laid down in the carriageway.
DK44230C
(en)
Device for the automatic switching on of traffic signals at road crossings by means of two contact thresholds arranged one behind the other in the road transverse to the direction of travel