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Specification for tractive armature direct current neutral-polar line relays for railway signalling.
STANDARD published on 14.7.1950
Designation standards: BS 519:1950
Note: WITHDRAWN
Publication date standards: 14.7.1950
SKU: NS-69792
The number of pages: 14
Approximate weight : 42 g (0.09 lbs)
Country: British technical standard
Category: Technical standards BS
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