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
CA653883A
Inventor
P. Sweeney Maxwell
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.)
United Engineers and Constructors Inc
Original Assignee
United Engineers and Constructors Inc
Publication date
Application grantedgrantedCritical
Publication of CA653883ApublicationCriticalpatent/CA653883A/en