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DE923929C
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Magnetron tubes
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DE931543C
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Electrode feed for magnetic field tubes
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DE916956C
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Amplifier circuit for hearing impaired devices
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DE927815C
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Circuit for delay-free volume limitation
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DE929095C
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Device for the automatic change of disc-shaped sound carriers
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DE921638C
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Grid-controlled gas discharge tubes with cold cathode for direct or alternating voltage
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DE900851C
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Multi-slot magnetic field tubes for shortest shafts with an even number of anode segments
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DE925965C
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High vacuum annealing furnace with direct resistance heating of the annealed material
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DE893236C
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Magnetron tubes with anode system arranged in a glass bulb
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DE889194C
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Secondary emission cathode for magnetron tubes
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DE879560C
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Public address system with microphone
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DE906871C
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Articulated connection
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DE877205C
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Combined magnetic head with two working gaps
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DE896125C
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Device for automatic feeding of records for speaking machines
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DE885163C
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Universal double needles for normal and micro-groove records
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DE864807C
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Flashlight device with several gas discharge paths and suitable flashlight tubes for this
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DE864806C
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Electric flashlight device with a gas discharge path
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DE869672C
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Magnetic fastener
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DE869998C
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High vacuum melting furnace
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DE869666C
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Electric valve
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