| 摘要 |
A safety booster cable assembly for charging batteries from a D.C. source having one conductor for each electrode and one of those electrodes being normally interrupted by a relay, when there is no current through it, and the relay circuit is closed when the polarities of the conductors correspond. An AND, NAND or other suitable logic function, has its inputs connected to the source and battery electrodes connected through the normally interrupted conductor so that a suitable output is provided, when the polarities match, to activate the coil of the relay.
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