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DE833256C
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Device for photographing the screen images of several cathode ray oscilloscopes
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DE737432C
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Arrangement for measuring alternating voltages
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DE678923C
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Arrangement to compensate for the drop in interference voltage that occurs in the grounding electrode when the electrocardiogram is recorded
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DE688145C
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Arrangement for recording the electrocardiogram with amplifiers
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DE699255C
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Arrangement for amplifying the difference between the potentials by means of a grounded amplifier
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DE690207C
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Arrangement for measuring DC voltages with an amplifier tube
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DE716042C
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Arrangement for regulating the terminal voltage on a power consumer
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DE685045C
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Device for the derivation of electrical voltages in disturbance-sensitive arrangements, especially on biological objects
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DE731488C
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Method for measuring static charges of small capacities with high vacuum amplifier tubes
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DE695601C
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Method for measuring static charges or changes in charge of small capacities by means of high vacuum amplifier tubes
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DE659459C
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Galvanic coupling of a single-tube stage with a push-pull tube stage
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