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On drawings, abbr. for duplicate

1. Pieces of timber which are used to provide structural support for a large item of equipment on a rooftop.

Any type of truck whose body can be tilted to discharge its load.

A large unexcavated mass, usually at the center of an excavated area, which is left undisturbed; may be removed when

Excavated material, usually enddumped from trucks, with no special effort made to spread or compact it.

For a door lock, a mock cylinder which has no operating mechanism.