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
CA860974A
Inventor
Payen Pierre
Tiquet Jacques
Roy Georges
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.)
Charbonnages de France CDF
Original Assignee
Charbonnages de France CDF
Publication date
Application grantedgrantedCritical
Publication of CA860974ApublicationCriticalpatent/CA860974A/en