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DE428869C
|
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Loudspeaker receiver
|
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DE422994C
|
|
Loudspeaker receiver
|
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DE425047C
|
|
Loudspeaker telephone
|
|
DE423809C
|
|
Vibrating bodies for speech apparatus, especially for telephones, microphones and sound boxes
|
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DE413437C
|
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Exposure device for recording speaking films
|
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DE331928C
|
|
Rotary switch for a large number of electrical circuits
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DE327979C
|
|
Telephones with protruding natural oscillation
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DE330269C
|
|
Rotary switch for a large number of electrical circuits
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DE418105C
|
|
Funnel loudspeaker with telephone
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DE445674C
|
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Multiple switch
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