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Stockphotos.ro (c) 2025. All stock photos are provided by Dreamstime and are copyrighted by their respective owners.
thermoionic |
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| navigate by keyword : 1950s air airtight amplifier anode cathode component current edison electrical electron electronics equipment history ideas industry invention lamp pentode radio store style television tetrode thermoionic transistor triode tube vacuum valve |
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| Old vacuum tubes on white background |
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Stockphotos.ro (c) 2025. All stock photos are provided by Dreamstime and are copyrighted by their respective owners. |
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