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
CA789310A
Inventor
L. Sawyer Frank
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.)
Robert Manufacturing Co
Original Assignee
Robert Manufacturing Co
Publication date
Application grantedgrantedCritical
Publication of CA789310ApublicationCriticalpatent/CA789310A/en