A video tape recorder (VTR) is a tape recorder designed to record and play back video and audio material from magnetic tape. The early VTRs were open-reel devices that record on individual reels of 2-inch-wide (5.08 cm) tape.
invented by Christopher Cockerell
A hovercraft, also known as an air-cushion vehicle or ACV, is an amphibious…
invented by Allan Kardec
Named after 10th-century Denmark king Harald “Bluetooth” Gormsson
A ball screw is a mechanical linear actuator that translates rotational motion…
invented by Jacques E. Brandenberger.
Cellophane is a thin, transparent sheet made of regenerated cellulose. Its low…
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