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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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BS

PDF Standards BS 4196-1:1981

Sound power levels of noise sources-Precision methods for determination of sound power levels for broad-band sources in reverberation rooms
standard by BSI Group, 01/30/1981

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