GB/T 16608.52-2012 Electromechanical all-or-nothing relays.Part 52:Blank detail specification.Electromechanical all-or-nothing telecom relays of assessed quality.Two change-over contacts,20mm×10mm base was changed to GB/T 16608.1-2023 Basic electromechanical relays for telecommunications with qualification - Part 1: General specification and blank detail specification.
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