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BS

PDF Standards BS 3172-1:1959

Screw threads for spectacle frames-Specification for screw threads of Unified form for spectacle frames including screwing taps and screw gauges
standard by BSI Group, 09/30/1980

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BS

PDF Standards BS 4196-3:1981

Sound power levels of noise sources-Engineering methods for determination of sound power levels for sources in special reverberation test rooms
standard by BSI Group, 01/30/1981

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