United States Patent 2457968
US Patent References:
Picture-projection apparatus
- - 1602499
Highway traffic control system
- - 1921423
Traffic control system
- - 1931851
Equipment for dog race-tracks
- - 1965287
Method of and means for regulating traffic
- - 2007801
Picture-projection apparatus
- - 1602499
Highway traffic control system
- - 1921423
Traffic control system
- - 1931851
Equipment for dog race-tracks
- - 1965287
Method of and means for regulating traffic
- - 2007801
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340/323R, 472/85, 340/932, 434/255
US Patent References:
| 2044617 | Traffic signaling system |