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
CA720555A
Inventor
Donald Hughson J.
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.)
SPX Corp
Original Assignee
J Donald Hughson
General Signal Corp
Publication date
Application grantedgrantedCritical
Publication of CA720555ApublicationCriticalpatent/CA720555A/en