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DK22008C
(en)
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Procedure for Transmitting Signals Using High-Speed Sound Waves.
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DK29827C
(en)
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Receiving device for underwater sound signals.
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DK31175C
(en)
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Device for Direction Determination of Sound Waves.
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DK23075C
(en)
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Procedure for Converting Sound Waves.
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DK21911C
(en)
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Device by Detectors for Sound Waves.
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AT88431B
(en)
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Receiving device for underwater sound signals.
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FR539754A
(en)
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Acoustic receiver
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DK21917C
(en)
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Sound filter for sound reproducers.
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DK29921C
(en)
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Interference-Free Device Receiving Audio Signals.
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DK30049C
(en)
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Apparatus for transmitting radio signals.
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ES61252A1
(en)
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Apparatus for the phonographic reception and reproduction of words transmitted by telephone.
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DK31742C
(en)
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Device for Direction Determination of Sound Waves.
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DK22284C
(en)
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Sound funnel for Microphones.
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DK31635C
(en)
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Underwater sound receiver.
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FR532114A
(en)
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Transmitter arrangement for underwater acoustic signals
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FR22076E
(en)
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Receiver for underwater acoustic signals
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AT78915B
(en)
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Signal apparatus for the transmission of several independent signals.
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FR490806A
(en)
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Receiver for telephones and microtelephones
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DK27623C
(en)
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Procedure for Connecting Pipes.
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ES64251A1
(en)
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An improved procedure for the transmission of force by means of mechanical waves.
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DK14892C
(en)
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Receiver for submarine audio signals.
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FR518948A
(en)
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Acoustic device for receiving underwater sounds
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DK22002C
(en)
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Apparatus for Preventing the Transmission of Infection by Telephoning.
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FR497293A
(en)
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Advanced transmission mechanism
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FR497292A
(en)
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Advanced transmission mechanism
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