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IEC 61811-52 Ed. 2.0 b:2002
Electromechanical all-or-nothing relays - Part 52: Blank detail specification - Electromechanical all-or-nothing telecom relays of assessed quality - Two change-over contacts, 20 mm x 10 mm basestandard by International Electrotechnical Commission, 03/12/2002
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