BC-670
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This test box was provided for remote control operation of the high-voltage circuit of Rectifier RA-38 at its panel. The unit is a small box with a start and stop switch, a red pilot light, and a 3-foot cable terminated in a four pole plug, which connects into the rectifier in place of cable 22 coming from the keying unit. It was part of the AN~MPM-1 Test Set.