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  2. List of vacuum tubes - Wikipedia

    en.wikipedia.org/wiki/List_of_vacuum_tubes

    The following letter indicates the filament or cathode type, or the fill gas or other construction detail. The coding for vacuum devices differs between Philips (and other Continental European manufacturers) on the one hand and its Mullard subsidiary on the other. Philips vacuum devices: A; Microwave tubes: Output power <1W

  3. Category:Vacuum pumps - Wikipedia

    en.wikipedia.org/wiki/Category:Vacuum_pumps

    Category: Vacuum pumps. 9 languages. ... Most general pumps can increase as well as decrease the pressure of a gas; however, this category contains pumps that are ...

  4. Vacuum tube battery - Wikipedia

    en.wikipedia.org/wiki/Vacuum_tube_battery

    Eveready 761 "C" battery with 4.5-volt, 3-volt, 1.5-volt tap screw terminals. The "C" battery is used to provide bias to the control grid. Until the early 1930s this was common practice in valve (tube) radio sets but was largely superseded by grid leak resistors or voltage divider biasing. Because the tube grids draw no current, the "C" battery ...

  5. Submersible pump - Wikipedia

    en.wikipedia.org/wiki/Submersible_pump

    A 0.75 HP bore-well submersible pump which had been used to pump groundwater One style of submersible pump for industrial use. Outlet pipe and electrical cable not connected. A submersible pump (or electric submersible pump (ESP) is a device which has a hermetically sealed motor close-coupled to the pump body. The whole assembly is submerged in ...

  6. Mini Electric - Wikipedia

    en.wikipedia.org/wiki/Mini_Electric

    At launch, the factory could build up to 120 Mini Electric vehicles per day, and already had 2,000 preorders for the UK market. [23] In the UK, the Mini Electric was offered in one of three different trim levels, with suggested retail prices ranging from £27,900 (for the "Level 1" trim) to £29,900 (Level 2) and £33,900 (Level 3). [24]