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  2. Enercell - Wikipedia

    en.wikipedia.org/wiki/Enercell

    The free Enercells were individual AA, C or D cells or 9V rectangular transistor radio batteries. [2] Like the free tube testing [clarification needed] offered in-store in the early 1970s, [3] this small loss leader helped draw foot traffic. There were two editions of a "Enercell Battery Guidebook", published in 1985 and 1990.

  3. Comet (retailer) - Wikipedia

    en.wikipedia.org/wiki/Comet_(retailer)

    Comet was founded in Hull in 1933 by entrepreneur George Hollingbery as Comet Battery Stores. Hollingbery had noticed the increasing popularity of the wireless radio during the 1930s and launched a service which involved himself and one other employee charging batteries in his workshop and delivering them to customers for a small weekly fee.

  4. Batteryless radio - Wikipedia

    en.wikipedia.org/wiki/Batteryless_radio

    A batteryless radio is a type of radio receiver that does not require the use of a battery to provide it with electrical power. Originally this referred to units which could be used directly by AC mains supply (mains radio); it can also refer to units which do not require a power source at all, except for the power that they receive from an ...

  5. C. Crane Company - Wikipedia

    en.wikipedia.org/wiki/C._Crane_Company

    C. Crane Skywave SSB Battery Operated Portable Travel Radio AM, FM, Shortwave, NOAA Weather Alert, Scannable VHF Aviation Band and Single Side Bands. C. Crane is an American electronics retailer based in Fortuna, California. The company mainly deals in specialty radio and lighting equipment and is best known for its GeoBulb line of LED light bulbs.

  6. PMR446 - Wikipedia

    en.wikipedia.org/wiki/PMR446

    Motorola TA288 PMR446 licence-free radio Motorola TLKR T40 radio tuned to PMR channel 1. PMR446 (Private Mobile Radio, 446 MHz) is a licence-exempt service or UHF CB in the UHF radio frequency band, as personal radio service or citizens band radio, and is available for business and personal use in most countries throughout the European Union, [1] Malaysia, [2] and Singapore.

  7. Crystal radio - Wikipedia

    en.wikipedia.org/wiki/Crystal_radio

    Type 'C' Form 'A' twin detector crystal radio set, manufactured by British Thomson Houston Ltd. in 1924, kept at the Museum of the radio - Monteceneri (Switzerland) Early radio telegraphy used spark gap and arc transmitters as well as high-frequency alternators running at radio frequencies. The coherer was the first means of detecting a radio ...

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