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
CA639230A
Inventor
W. Jones Harry
A. Herpich William
R. Dempster George
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.)
GEORGE R DEMPSTER AND DEMPSTER BROTHERS
Original Assignee
GEORGE R DEMPSTER AND DEMPSTER BROTHERS
Publication date
Application grantedgrantedCritical
Publication of CA639230ApublicationCriticalpatent/CA639230A/en