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There used to be a company that advertised on one of the top radio stations here for sales and repair of VFD's. Most of the listenership had no idea what a VFD was. Those of us who are techies speculated that the ads were probably trade-outs for the station. Station transmitters use big motors whether they are air cooled or water cooled. So, if the station aired the ads, they could get their VFD's repaired for free.
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