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spark gap
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Telefunken spark gap (small)
Telefunken spark gap (large)
Gas-filled spark gap - CV 1507
Wagner pattern spark gap
Wagner pattern spark gap
Rotary spark gap for lorry set
Rotary spark gap for lorry set
Pre 1915. Screw seperated electrodes in glass cylinder. For x-ray use.
Siemens Spark Gap
1895-1915