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.)
SPX Corp
Original Assignee
Joseph E Willing
General Railway Signal Co
Publication date
Application grantedgrantedCritical
Publication of CA344242ApublicationCriticalpatent/CA344242A/fr