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And Another: Spidot a Self-Powered Unit Which Is An Integral Part of the Trolley the Engine Is High Above the Water Note the Anchor Which Is Dropped on Shoreline Fo

And another: SPIDOT a self-powered unit which is an integral part of the trolley. The engine is high above the water. Note the anchor which is dropped on shoreline for emergency recovery of the unit. Note, too, the guiding lights on the trolley's upright posts..

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