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DK14892C
(en)
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Receiver for submarine audio signals.
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DK15209C
(en)
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Submarine Sound Signal Apparatus.
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DK30721C
(en)
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Receiver for Radio Signals.
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AT70633B
(en)
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Receiver for underwater sound signals.
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DK13841C
(en)
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Sound transmitter, especially for underwater Signal Devices.
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DK20386C
(en)
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Apparatus for Receiving Underwater Audio Signals.
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DK15903C
(en)
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Submarine Sound Signal Transmitter.
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CA140040A
(en)
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Submarine signal
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DK29827C
(en)
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Receiving device for underwater sound signals.
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DK13935C
(en)
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Submarine Signal Apparatus.
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DK29579C
(en)
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Closed Underwater audio signal transmitter.
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AT71524B
(en)
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Receiver for underwater sound signals.
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AT88431B
(en)
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Receiving device for underwater sound signals.
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DK21917C
(en)
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Sound filter for sound reproducers.
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FR436383A
(en)
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Telephone receiver
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CA166811A
(en)
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Selective signal
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AT71320B
(en)
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Retractable receiver for underwater sound signals.
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CA133457A
(en)
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Signal system
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CA163464A
(en)
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Signal system
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DK29921C
(en)
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Interference-Free Device Receiving Audio Signals.
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DK14310C
(en)
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Bell Buoy for Underwater Signaling.
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AT78915B
(en)
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Signal apparatus for the transmission of several independent signals.
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DK21912C
(en)
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Control device for detectors for recording submarine sound signals.
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CA136157A
(en)
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Submarine signal
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DK32063C
(en)
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Receiver for wireless Signals.
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