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ASA/BS

abbreviation for

  1. an obsolete expression of the speed of a photographic film, replaced by the ISO rating
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word History and Origins

Origin of ASA/BS1

C20: from American Standards Association/British Standard

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