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Rotary Spark Gap - YouTube
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Synchronous Rotary Spark Gap
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Another Blogger Blog: Pyramider: The evolution from Spark Gap to IGBT
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Two different model Murdock Rotary Spark Gaps | Spark gap, Antique radio, Vintage radio
File:Rotary spark gap 1919.jpg - Wikimedia Commons
Rotary Spark Gap by teslaextreme on DeviantArt
