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
CA730092A
Inventor
L. Miller Henry
R. Ramsden Thomas
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.)
WEST PENN SCREEN SERVICE
Original Assignee
WEST PENN SCREEN SERVICE
Publication date
Application grantedgrantedCritical
Publication of CA730092ApublicationCriticalpatent/CA730092A/en