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BS 2733:1956

Specification. Intrinsically safe magneto-call telephones primarily for use in coal mines
standard by BSI Group, 03/14/1956

BS 1853-1:1979

Tubular fluorescent lamps for general lighting service.-Specification for internationally specified lamps
standard by BSI Group, 08/31/1979

BS 2782-9 METHOD 940B:1981

Methods of testing plastics. Sampling and test specimen preparation-Preparation of test specimens of amorphous thermoplastic moulding material with a defined level of shrinkage in the form of rectangular plates by injection moulding
standard by BSI Group, 12/31/1981