| http://www.w3.org/ns/prov#value | - still another schematic electrical diagram illustrating a further embodiment of the invention in which the fire valve is controlled by the unloading system.Apparatus constructed in accordance with the invention is adapted foruse with a conventional tank trailer 1, having a chassis 2 provided with wheels 3 and a cylindrically or other shaped tank 4 which is to contain a liquid such as crude oil
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