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BS 1000[621.6]:1973

Universal Decimal Classification. English full edition-Fluids handling, storage and distribution plant and equipment
standard by BSI Group, 03/15/1973

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