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
CA748404A
Inventor
Kojima Hisao
Ito Yasuto
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.)
Nihon Hikaku KK
Original Assignee
Nihon Hikaku KK
Publication date
Application grantedgrantedCritical
Publication of CA748404ApublicationCriticalpatent/CA748404A/en