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BS 1875:1952

Specification for bi-pin lamp-holders for tubular fluorescent lamps for use in circuits the declared voltage of which does not exceed 250 volts
standard by BSI Group, 08/31/1979

BS 1852:1967

Specification for marking codes for values and tolerances of resistors and capacitors
standard by BSI Group, 01/16/1967

BS 2782-4 METHOD 454E:1978

Methods of testing plastics. Chemical properties-Determination of plasticizer absorption at room temperature of PVC resins for general use
standard by BSI Group, 03/31/1978