DE623035C
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Variometer
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DE615601C
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Variometer
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DE578581C
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Isolation tester
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DE425563C
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Registration device, in particular for conveyor machines
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DE408614C
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Breakdown of a registration instrument into its two essential parts, namely the writing device and the pointer adjustment system
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DE370927C
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Circuit arrangement for ohmmeter for small resistance measuring ranges
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DE346051C
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Film running time indicator
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DE403403C
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Facility for achieving point-by-point recording
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DE507397C
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Eddy current speedometer
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DE402454C
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Pointer drive of a rotary pendulum tachometer
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DE644666C
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Wind speedometer
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