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
CA648023A
Inventor
E. Van Valkenburg Howard
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 CA648023ApublicationCriticalpatent/CA648023A/en