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  2. Velodyne - Wikipedia

    en.wikipedia.org/wiki/Velodyne

    Velodyne Marine debuted its first self-stabilizing craft, the Martini, at the 2013 Miami boat show. This prototype was the world's first sea-faring vessel with an active suspension. [ 8 ] The Martini derives its name from the claim that it can keep a cocktail from spilling even on turbulent waters. [ 7 ]

  3. Diving equipment - Wikipedia

    en.wikipedia.org/wiki/Diving_equipment

    Lifeline (or tether): A line from the diver to a tender at the surface control point, which may be used for: [12] communications, by diving line signals, to allow the diver to be found by the stand-by diver following the line, to provide a guideline to the surface control point to guide the diver on return,

  4. Subwoofer - Wikipedia

    en.wikipedia.org/wiki/Subwoofer

    The most common subwoofer driver sizes used for sound reinforcement in nightclubs, raves and pop/rock concerts are 10-, 12-, 15- and 18-inch models (25 cm, 30 cm, 38 cm, and 45 cm respectively). The largest available sound reinforcement subwoofers, 21-inch (53 cm) drivers, are less commonly seen. [citation needed]

  5. Surface-supplied diving equipment - Wikipedia

    en.wikipedia.org/wiki/Surface-supplied_diving...

    The gas panel may be fairly large and mounted on a board for convenience of use, or may be compact and mounted inside a portable box, for ease of transport. Gas panels are usually for one, two or three divers. In some countries, or under some codes of practice, the surface standby diver must be supplied from a separate panel to the working diver/s.

  6. Long-range acoustic device - Wikipedia

    en.wikipedia.org/wiki/Long-range_acoustic_device

    Acoustic hailing devices are acoustic devices capable of outputting intelligible sound at very high volumes. The distance at which acoustic hailing can be effective varies based on several factors including the sound level, directionality, and frequency of the acoustic source, the sensitivity and directionality of the receiver, and the transmission channel environment.

  7. Public address system - Wikipedia

    en.wikipedia.org/wiki/Public_address_system

    Four years later, in 1915, they built a dynamic loudspeaker with a 1-inch (2.5 cm) voice coil, a 3-inch (7.6 cm) corrugated diaphragm and a horn measuring 34 inches (86 cm) with a 22-inch (56 cm) aperture. The electromagnet created a flux field of approximately 11,000 Gauss. [9]

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