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PDF Standards BS 142-2-2.1:1982

Electrical protection relays. Requirements for the principal families of protection relays-Specification for all-or-nothing electrical protection relays
standard by BSI Group, 11/30/1982

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PDF Standards BS 10-4:1931

Pipe flanges for land use Flanges for working steam pressures above 600 Lb. and up to 900 Lb. per sq. inch and temperatures up to 800 F (427 C)
standard by BSI Group, 04/13/1931

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