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US2816167A
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Telephonograph system and apparatus and method
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GB653301A
|
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Audio-frequency band filter with adjustable band width
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US2510268A
|
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Wiring system for the selective filtering of vowel sounds
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US2541797A
|
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Audio-frequency band filter with adjustable band width
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GB656156A
|
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Improvements in or relating to telephonographs
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GB657494A
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Improvements in and relating to sound carriers for magnetic recording and to a process for manufacturing the same
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GB656922A
|
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Improvements in and relating to devices on telephonographs for switching them off after completed reproduction
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US2562665A
|
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Movement control device for magnetic sound heads on sound recording and sound reproducting machines
|
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US2542192A
|
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Device for the remote control of electrical circuits
|
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US2519568A
|
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Method of operating telephonographs
|
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US2519592A
|
|
Device for the magnetic recording on, and reproducing from, diskshaped sound carriers
|
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US2519567A
|
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Device for automatically switching off a telephonograph
|
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GB656393A
|
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Telephonography
|
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GB655160A
|
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Telephonograph
|
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ES177197A1
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A procedure, with corresponding device, for the magnetic inscription of impulses and, especially of sounds
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ES176472A1
|
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A procedure, with the corresponding procedure, for the registration and reproduction of electrical impulses, and especially of sounds
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ES175568A1
|
|
A procedure and device for the registration of electrical and, especially, sound impulses
|
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CA605335A
|
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Telephone answering system
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CA494212A
|
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Voice controlled reversing device for telephonograph
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