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
CA627853A
Inventor
T. Betz Howard
L. Sowers Hal
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.)
DA-LITE SCREEN Co
Original Assignee
DA-LITE SCREEN Co
Publication date
Application grantedgrantedCritical
Publication of CA627853ApublicationCriticalpatent/CA627853A/en