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Specification for control switches: (switching devices, including contactor relays, for control and auxiliary circuits up to and including 1000 V a.c. and 1200 V d.c.) (BS4794. Part 1. 1973)
Specification for control switches - switching devices, including contactor relays, for control and auxiliary circuits up to and including 1000 V a.c. and 1200 V d.c. - BS4794. Part 1. 1973 Author:British Standards Institution
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