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PDF Standards BS 109:1922

Air-break knife switches and air-break isolating switches for voltages not exceeding 660 volts excluding totally-enclosed and flame proof types
standard by BSI Group, 01/30/1933

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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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