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
CA874896A
Inventor
B. Tarbuck Geoffrey
A. Tate James
R. Butterworth Hiram
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.)
HENRY BERRY AND Co Ltd
British Railways Board
Original Assignee
HENRY BERRY AND Co Ltd
British Railways Board
Publication date
Application grantedgrantedCritical
Publication of CA874896ApublicationCriticalpatent/CA874896A/en