Corpus ID: 56086710

Patented Apr . 11 , 1950 2 , 503 , 574 UNITED STATES PATENT OFFICE 2

@inproceedings{Allen2017PatentedA,
  title={Patented Apr . 11 , 1950 2 , 503 , 574 UNITED STATES PATENT OFFICE 2},
  author={S. Allen and Destrian Traffic Scnal and J S.},
  year={2017}
}