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.
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Stereolithography
invented by Chuck Hull
Stereolithography (SLA or SL; also known as stereolithography apparatus,…
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invented by Fritz Haber
The Haber process, also called the Haber–Bosch process, is an artificial…
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