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BS 1224:1945

Specification for electroplated coatings of nickel and chromium on steel and brass
standard by BSI Group, 07/31/1945

BS 1471:1972

Specification for wrought aluminium and aluminium alloys for general engineering purposes – drawn tube
standard by BSI Group, 03/15/1972

BS 2497-6:1988

Acoustics. Reference zero for the calibration of audiometric equipment-Specification for a standard reference zero using an artificial ear complying with BS 4669
standard by BSI Group, 02/29/1988