Patents Assigned to Larry H. Williamson
  • Emergency back-up underwater breathing apparatus
    Patent number: D251622
    Type: Grant
    Filed: April 20, 1978
    Date of Patent: April 17, 1979
    Assignee: Larry H. Williamson
    Inventors: George E. Garrison, James R. Hagadorn, Joseph Borden, Larry H. Williamson