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BS 1747-7:1983

Methods for measurement of air pollution-Determination of mass concentration of sulphur dioxide in ambient air: Thorin spectrophotometric method
standard by BSI Group, 01/31/1983

BS 142-2-2.3:1991

Electrical protection relays. Requirements for the principal families of protection relays-Specification for thermal electrical relays
standard by BSI Group, 05/31/1991