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
CA637186A
Inventor
Y. Howard James
A. Scheg Marcian
S. Craig Frank
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.)
SPX Corp
Original Assignee
Frank S Craig
James Y Howard
Marcian A Scheg
General Railway Signal Co
Publication date
Application grantedgrantedCritical
Publication of CA637186ApublicationCriticalpatent/CA637186A/en