作者: James L. Berry
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摘要: The disclosure herein in directed to aligning devices for a towing vehicle with trailer wherein the has ball and socket carrying arm. A pair of magnetic bases having vertically positionable wands are placed one on trailer. Each wand an elastic gromet slidable along its length retaining signal flag upper side permit passage between plumb line. There two lines bobs which when vertical positioned immediately above socket, alignment flags will be horizontal so that is backed toward unit cross then hookup can effectuated.