prov:value
| - Referring to FIGS. 1A, 2A, 3 or 3A, the controller 22 and the power source 23, such as for example a battery, are connected in a circuit, with the controller 22 preferably including a microprocessor, a dc/dc converter to increase the battery supply to approximately 30 volts, a current regulator which is controlled by the microprocessor and a switch 56, or a switch 66, for switching the direction o
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