Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
CA639958A
Inventor
Operhall Theodore
W. Schwartz Charles
Van Schoik Dickson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Howe Sound Co
Original Assignee
Howe Sound Co
Publication date
Application grantedgrantedCritical
Publication of CA639958ApublicationCriticalpatent/CA639958A/en