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PDF Standards IEC 61811-53 Ed. 2.0 b:2002

Electromechanical all-or-nothing relays – Part 53: Blank detail specification – Electromechanical all-or-nothing telecom relays of assessed quality – Two change-over contacts, 14 mm x 9 mm base
standard by International Electrotechnical Commission, 03/12/2002

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