BS 519:1950
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
Specification for tractive armature direct current neutral-polar line relays for railway signalling
Hardcopy , PDF
07-07-2014
English
14-07-1950
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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