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
CA697786A
Inventor
H. Perlmutter Jack
J. Hartmeister Ruben
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.)
PRESTRESSED CONCRETE OF COLORADO
Original Assignee
PRESTRESSED CONCRETE OF COLORADO
Publication date
Application grantedgrantedCritical
Publication of CA697786ApublicationCriticalpatent/CA697786A/en