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GB191001794A
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Improved Method of and Means for Suspending Telephonic Microphones in Combination with a Breast Plate.
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US986606A
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Telephone-body support.
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CA125026A
|
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Suspension for the microphone of a telephone
|
|
US954829A
|
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Telephone-microphone.
|
|
GB190816788A
|
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Improvements in Mounting Telephonic Microphones.
|
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GB190725448A
|
|
Improvements in Microphones and Telephonic Receivers.
|
|
GB190804286A
|
|
Improved Suspension Device for Microphones.
|
|
US1017604A
|
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Circuit-closer.
|
|
GB190716854A
|
|
Improvements in and relating to Telephonic Apparatus.
|
|
US956228A
|
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Long-distance-telephonic apparatus.
|
|
GB190411262A
|
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Method for the Transmission of Sound to Long Distances and Telephonic Apparatus therefor.
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