A liquid metal micro switch (LIMMS) 2 is mounted on each side of a multi-layer substrate 23. A pattern of vias on each side of the circuit board matches the pattern of connectors on each LIMMS. Electrical connectors 24-27 are arranged at a periphery of the board, and are interconnected with the vias by internal traces. A ground plane may be included either on an internal layer, or one of the surfaces.
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