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2. Single-hole cassette - Wikipedia

   en.wikipedia.org/wiki/Single-hole_cassette

   The single-hole cassette used the tape of compact cassette 3.81 mm (= 0.15 inch) wide only at a tape speed 1 + 7 ⁄ 8 inch = 4.7625 cm per second, rounded: 4.75 cm/s. To wind the tape back into the cassette, the single-hole cassette got onto its built-in tape reel ring gear with 8-teeth for traction, which represents the single hole.

3. Holographic Versatile Disc - Wikipedia

   en.wikipedia.org/wiki/Holographic_Versatile_Disc

   The Holographic Versatile Disc (HVD) is an optical disc technology that was expected to store up to several terabytes of data on an optical disc 10 cm or 12 cm in diameter. Its development commenced in April 2004. The technology was abandoned due to funding issues. One of the responsible companies went bankrupt in 2010. [2]

4. Slipmat - Wikipedia

   en.wikipedia.org/wiki/Slipmat

   A slipmat is a circular piece of slippery cloth or synthetic materials disk jockeys place on the turntable platter instead of the traditional rubber mat. Unlike the rubber mat which is made to hold the record firmly in sync with the rotating platter , slipmats are designed to slip on the platter, allowing the DJ to manipulate a record on a ...

5. Mat (picture framing) - Wikipedia

   en.wikipedia.org/wiki/Mat_(picture_framing)

   The added (though slight) weight of mats can help hold a piece in place while also helping to hide the backing and photo corners. In archival framing, the mats are not glued to the piece or backing, but are "hinged" to the backing with tape, though if more than one mat is used, the mats are typically glued to each other.

6. Reel-to-reel audio tape recording - Wikipedia

   en.wikipedia.org/wiki/Reel-to-reel_audio_tape...

   A reel-to-reel tape recorder (Sony TC-630), typical of a 1970s audiophile device. Reel-to-reel audio tape recording, also called open-reel recording, is magnetic tape audio recording in which the recording tape is spooled between reels. To prepare for use, the supply reel (or feed reel) containing the tape is placed on a spindle or hub.

7. Holography - Wikipedia

   en.wikipedia.org/wiki/Holography

   Two photographs of a single hologram taken from different viewpoints. Holography is a technique that enables a wavefront to be recorded and later reconstructed. It is best known as a method of generating three-dimensional images, and has a wide range of other uses, including data storage, microscopy, and interferometry.