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BSI BS 561:1951

Specification for alternating-current line relays double-element 3-position (for railway signalling)
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BSI BS 561:1951

Specification for alternating-current line relays double-element 3-position (for railway signalling)

PUBLISH DATE 1951
PAGES 16
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REAFFIRMED IN 1980
SDO BSI: British Standards Institution
Document Number BS 561
Publication Date June 15, 1951
Language en - English
Page Count 16
Revision Level
Supercedes
Committee
Publish Date Document Id Type View
June 15, 1951 BS 561:1951 Revision