Clarence L. Ellefson deceased

Person

  • late of Burbank, CA, US

Patents Grantslast 30 patents

  • Information Patent Grant

    Traffic control apparatus

    • Patent number 4,016,679
    • Issue date Apr 12, 1977
    • Rusco Industries, Inc.
    • Clarence L. Ellefson
    • E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES