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Vibrator (mechanical) — A vibrator is a mechanical device that is designed to generate vibrations. The vibration is often generated by an electric motor with an unbalanced mass on its driveshaft. If the motor is switched on, the rotating weight resonates.There are many… … Wikipedia
Deep foundation — A deep foundation installation for a bridge in Napa, California, United States … Wikipedia
Building material — For other kinds of building materials, see Hardware, Biology, and Star formation. Concrete and metal rebar used to build a floor Building material is any material which is used for a construction purpose. Many naturally occurring substances, such … Wikipedia
Energy — This article is about the scalar physical quantity. For other uses, see Energy (disambiguation). Energetic redirects here. For other uses, see Energetic (disambiguation) … Wikipedia
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