A vacuum tube, electron tube, valve (British usage), or tube (North America), is a device that controls electric current flow in a high vacuum between electrodes to which an electric potential difference has been applied.
invented by Leo Baekeland
Polyoxybenzylmethylenglycolanhydride, better known as Bakelite…
invented by Chuck Hull
Stereolithography (SLA or SL; also known as stereolithography apparatus,…
invented by Panasonic Philips Sony Toshiba
The DVD (common abbreviation for Digital Video Disc or Digital Versatile Disc)…
invented by John Ambrose Fleming
The Fleming valve, also called the Fleming oscillation valve, was a thermionic…
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