BS 161:1925 PDF Download
$151.00Tungsten filament electric lamps
standard by BSI Group, 08/03/1927
BSI Group
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Tungsten filament electric lamps
standard by BSI Group, 08/03/1927
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standard by BSI Group, 12/10/1928
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standard by BSI Group, 09/01/1935
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standard by BSI Group, 05/06/1958
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standard by BSI Group, 11/18/1949
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standard by BSI Group, 10/02/1961