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PDF Standards BS 4814-1:1972

Specification for expansion vesses for sealed hot water heating systems. Domestic and small industrial systems using vessels with an internal diaphragm
standard by BSI Group, 04/07/1972

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BS

PDF Standards BS 4794-1:1973

Control switches ( switching devices including contractor relays for control and auxiliary circuits up to and including 1000V a.c. and 1200V d.c
standard by BSI Group, 11/27/1973

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