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
CA593458A
Inventor
W. Franklin Laurence
J. Reynolds Marvin
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.)
Western Union Telegraph Co
Original Assignee
Western Union Telegraph Co
Publication date
Application grantedgrantedCritical
Publication of CA593458ApublicationCriticalpatent/CA593458A/en