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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 1113:1992

Specification for design and manufacture of water-tube steam generating plant (including superheaters, reheaters and steel tube economizers)
standard by BSI Group, 06/15/1994

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