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BS 142-2-2.2:1982

Electrical protection relays. Requirements for the principal families of protection relays-Specification for general requirements for measuring relays used for protection
standard by BSI Group, 11/30/1982

BS 1000[31]:1982

Universal Decimal Classification. Second English full edition-Statistics. Demography. Population studies
standard by BSI Group, 03/31/1982

BS 137-1:1970

Insulators of ceramic material or glass for overhead lines with a nominal voltage greater than 1000 V. Methods of test
standard by BSI Group, 06/07/1974