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
CA674794A
Inventor
W. Cheney Charles
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.)
CW Cheney and Son Ltd
Original Assignee
CW Cheney and Son Ltd
Publication date
Application grantedgrantedCritical
Publication of CA674794ApublicationCriticalpatent/CA674794A/en