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DK6601C
(en)
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Device with a combined Headphone and Microphone.
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DK8649C
(en)
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Device with Headphone and Microphone located within the same Holster.
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DK7633C
(en)
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Combined Microphone and Telephone.
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FR341035A
(en)
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Microphone
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FR339458A
(en)
|
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Microphone
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CH30655A
(en)
|
|
Microphone
|
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FR11845E
(en)
|
|
Telephone microphone and receiver
|
|
FR342353A
(en)
|
|
Telephone microphone and receiver
|
|
FR350203A
(en)
|
|
Phone enhancements
|
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FR340435A
(en)
|
|
Telephone transmitter
|
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DK7171C
(en)
|
|
Telephone connection device.
|
|
DK6443C
(en)
|
|
Telephone Memorandum.
|
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FR344095A
(en)
|
|
Nickel steels development
|
|
FR345881A
(en)
|
|
Speakerphone and recorder
|
|
DK7021C
(en)
|
|
Device for Umbrellas, Umbrellas and the like.
|
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DK6941C
(en)
|
|
Cementtage device.
|
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FR395477A
(en)
|
|
Telephone device with double membrane microphone
|
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FR343299A
(en)
|
|
Perforation improvements
|
|
FR343361A
(en)
|
|
Perforation improvements
|
|
FR339553A
(en)
|
|
Receiver-repeater with microphone for sound-adjustable phonographic hearings and other applications
|
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DK6981C
(en)
|
|
Device by Relays and the like.
|
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ES34399A1
(en)
|
|
Improvements in telephone repeaters.
|
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DK5102C
(en)
|
|
Telephone device with strong sound reproduction.
|
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DK8079C
(en)
|
|
Microphone.
|
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DK8078C
(en)
|
|
Microphone.
|