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SU7681A1
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A device for light recording sounds and currents
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SU5770A1
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A device for photographic recording of sounds or changing currents
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SU2603A1
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Device for generating alternating current using a cathode lamp
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SU1914A1
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Galvanic cell
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SU1634A1
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Microphone and telephone amplifier
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SU1633A1
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Microphone and telephone amplifier
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SU3243A1
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Telephone set
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SU408A1
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Microphone-telephone cathode amplifier
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SU493A1
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Cathode lamp with external heating
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SU810A1
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Telephone translate
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SU1440A1
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Method of modulating high-frequency current for telephony by wire and without wire
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SU6242A1
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Phone
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SU482A1
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Electromagnetic Telegraph Receiver
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SU403A1
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The way to include amplifier in translation
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SU404A1
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Intermediate Circuit Cathode Amplifier and Battery Switch for Grid Circuits
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SU400A1
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Method for photographic recording of sound vibrations
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SU774A1
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Phonetic numerator and switch with drop valves
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SU464A1
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Telephone translate
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SU1343A1
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Telephone transformer
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SU466A1
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Electromagnetic relay
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