Jack (device)

src: i.ytimg.com A jack , screwjack or jackscrew is a mechanical device used as a lifting device to lift heavy loads or to apply great for...

Dental extraction

src: i.ytimg.com A dental extraction (also referred to as tooth extraction , exodontia , exodontics , or informally, tooth pulling ) is the...

Dump truck

src: upload.wikimedia.org A dump truck (known in the UK as a dumper/tipper truck ) is a truck used for transporting loose material (such a...

Crane (machine)

src: sc01.alicdn.com A crane is a type of machine, generally equipped with a hoist rope, wire ropes or chains, and sheaves, that can be use...