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.)
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.)
Niagara Blower Co
Original Assignee
Allan E Williams
Martin H Olstad
Niagara Blower Co
Publication date
Application grantedgrantedCritical
Publication of CA421993ApublicationCriticalpatent/CA421993A/en