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ES112233A1
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A membrane for acoustic purposes and especially for telephony.
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ES103762A1
|
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Installation for the measurement of low frequencies, especially the pulse.
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CA147326A
|
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Machine for receiving electric waves
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US1087113A
|
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Machine for receiving electric waves.
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GB191223734A
|
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Improvements in or pertaining to the Reception of Electric Waves in Wireless Telegraphy.
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US1088018A
|
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Means for working microphones in parallel.
|
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GB191215915A
|
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A Method of Enabling Speech-transmitting Instruments comprising Microphones to be Worked when Connected in Parallel.
|
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US1043047A
|
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Rotor for electric machines.
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US1207744A
|
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Asynchronous motor.
|
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GB191210507A
|
|
Improvements in and pertaining to High-speed Rotors for High-frequency Multipolar Electrical Machinery.
|
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CA154466A
|
|
High frequency transformer
|
|
US1104257A
|
|
High-frequency generator.
|
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GB191111162A
|
|
A High-frequency Transformer, especially suitable for use in Wireless Telegraphy and Telephony.
|
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GB191108978A
|
|
Method and Apparatus for the Intensifying of Weak Alternating Electric Currents.
|
|
US1043923A
|
|
Strengthening electric alternating currents.
|
|
GB191108387A
|
|
New or Improved Method of and Means for Receiving Electric Waves in Wireless Telegraphy and Telephony.
|
|
US1104256A
|
|
Apparatus for and method of receiving electric waves.
|
|
CA155226A
|
|
Wireless telegraphy apparatus
|
|
GB191011294A
|
|
Method for the Production of High Frequency Currents for use in Wireless Telegraphy and Telephony.
|
|
CA123578A
|
|
Method of producting electric currents
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