| 摘要 |
A remotely-steered trailer, and a sensor for sensing the direction of motion of a vehicle towing the trailer. The sensor includes a source of varyng electrical potential, rigidly fastened to the trailer; a pointer in electrical contact with the source of varying electrical potential; and a bar resiliently and perpendicularly connected to the pointer, pivotally connected to the trailer, and held in contact with the towing vehicle by a spring disposed between the pointer and the bar.
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