| http://www.w3.org/ns/prov#value | - The front wall 26 of the trailer unit is also open with the opening 22 mating with the opening at the rear of the van, and it may also be provided with closure means such as removable or folding doors or the like, as seen in FIG. 11, such closure being required of course when the two units are separated as shown in FIG. 2.
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