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Specification for tractive armature direct current neutral-polar line relays for railway signalling
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Available format(s): Hardcopy, PDF
Withdrawn date: 07-07-2014
Language(s): English
Published date: 14-07-1950
Publisher: British Standards Institution
Relays having up to four neutral contact-arms and up to four polar contact-arms. Construction (overall dimensions, electrical tests, performance characteristics); arrangement, marking of terminals.
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