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  2. Block heater - Wikipedia

    en.wikipedia.org/wiki/Block_heater

    Some cars are produced with block heaters from the factory, while others are fitted with block heaters as an aftermarket add-on. [3] The most common type of block heater is an electric heating element in the engine block , which is connected through a power cord often routed through the vehicle's grille.

  3. Mullard–Philips tube designation - Wikipedia

    en.wikipedia.org/wiki/Mullard–Philips_tube...

    Two or more elements in a single envelope were handled by adding letters after the heater identifier, in alphabetical order, so an ECH35 is a 6.3 volt heated triode plus a hexode with an octal base; a PABC80 is a Noval 300mA series-heater combination of a single low-power diode A, a pair of diodes with common cathode B, and a triode C.

  4. List of vacuum tubes - Wikipedia

    en.wikipedia.org/wiki/List_of_vacuum_tubes

    L – 450 mA AC/DC series heater; was shifted here from Y; M – 1.9 V, directly heated; N – 12.6 V, indirectly heated; O – Cold cathode; by 1955 this also included semiconductors as these had no heater; Philips sold a family of 150mA series heater tubes under this letter in South America [7] P – 300 mA AC/DC series heater; Q – 2.4 V ...

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  6. Template : Buildings along Spring from Temple to 3rd streets

    en.wikipedia.org/wiki/Template:Buildings_along...

    It was sometimes called Phillips Block No. 1 (there was a "Phillips Block No. 2" at 135–145 Los Angeles Street, on the west side between Market and First streets). [9] In July 1888, Asher Hamburger opened the Peoples Store here, later known as Hamburger's ; it became the largest retail store in the Western United States.

  7. Andrew Freeman (inventor) - Wikipedia

    en.wikipedia.org/wiki/Andrew_Freeman_(inventor)

    Andrew Freeman (March 10, 1909 – January 17, 1996) was an American electrical engineer and the inventor of the electric block heater for automobiles. [1] Andrew L. Freeman was born in Upham, North Dakota. He attended the University of North Dakota in Grand Forks, North Dakota, where he majored in electrical engineering.