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BS 519:1950
M00000522
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BS 519:1950 Specification for tractive armature direct current neutral-polar line relays for railway signalling
standard by BSI Group, 07/14/1950
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Full Description
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.Cross References:
BS 442