DE827220C
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Arrangement and procedure for the precise measurement, regulation and maintenance of low and medium frequencies
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DE826770C
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Arrangement for frequency conversion
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DE581156C
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Arrangement for measuring high and very high voltages by means of a spherical spark gap
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DE588170C
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Arrangement for suppressing the harmonics five times the frequency in the magnetizing current of three-phase transformers
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DE589724C
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Arrangement for frequency conversion in static frequency converters
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DE619234C
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Quiet frequency converter with star-connected primary windings
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DE575183C
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Push-pull amplifier transformer
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DE599956C
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Arrangement for frequency conversion with the help of transformers
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DE674954C
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Quiet frequency converter
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DE539780C
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Arrangement for frequency conversion from a multi-phase system
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DE580008C
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Circuit for frequency multiplication
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DE463784C
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High frequency melting or annealing furnace
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DE595738C
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Arrangement for frequency conversion by means of a static frequency converter
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