发明授权
US3641487A Traffic control light with means responsive to a power failure 失效
具有对电源故障的响应的交通控制灯

Traffic control light with means responsive to a power failure
摘要:
A traffic control light is provided with a supplemental lamp which is illuminable by a secondary power source. Switching means are also provided which are responsive to a failure of the primary power source to connect the supplemental lamp to the secondary source so that the supplemental lamp is illuminated in a flashing mode to continue traffic control.
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