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
CA808581A
Inventor
Ishikawa Hidehiko
Ozaki Shuzo
Sato Shui
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.)
Keuffel and Esser Co
Original Assignee
Keuffel and Esser Co
Publication date
Application grantedgrantedCritical
Publication of CA808581ApublicationCriticalpatent/CA808581A/en