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
CA612729A
Inventor
Joseph F. Cooper, Jr.
E. Swanson Swan
E. Swanstrom John
H. Connell Wade
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.)
DIAMOND CALK HORSESHOE Co
Original Assignee
DIAMOND CALK HORSESHOE Co
Publication date
Application grantedgrantedCritical
Publication of CA612729ApublicationCriticalpatent/CA612729A/en