A power-supply control device includes a power-supply control section, a first detection section that detects whether or not a body capable of movement is moving, a second detection section that detects whether or not the body capable of movement exists, and an instruction section. The blades are constructed in discrete straight sections that, when joined, approximate a helix or any other efficient turbine shape. In operation, the portable unit is scanned across a target and the displayed image is conveniently presented to the operator whereby the displayed image corresponds exactly to the target, or a scaled fashion if desired. The metal M may be copper, silver or gold. The construction equipment having excavation and loading functions is constructed in such a manner that a work equipment comprised of at least one link member, the link member being connected by a hinge and provided with fixed pin holes, is provided at a predetermined position above a main equipment traveled by a crawler or a wheel, so as to be used as an excavator and a loader.