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A video tape recorder (VTR) is a tape recorder designed to record and playback 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.
More recent innovations in underlay materials include recycled plastic underlay, which can be made from plastic bottles and other single-use plastics for reduced environmental impact. [3] Carpet underlays are typically 6-12 mm thick. They primarily provide foot comfort, but they also reduce carpet wear and provide sound and thermal insulation.
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[3]: 136–137 Because patients' soft-tissue undercuts may be shallow or deep, impression materials vary in their rigidity in order to obtain an accurate impression. Rigid materials are used with patients with shallow undercuts, while elastic materials are used with patients with deep undercuts, as the material must be flexible enough to reach ...