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DK15903C
(en)
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Submarine Sound Signal Transmitter.
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FR458380A
(en)
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Silent time receiver
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AT70633B
(en)
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Receiver for underwater sound signals.
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FR23488E
(en)
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Receiver for underwater acoustic signals
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AT71524B
(en)
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Receiver for underwater sound signals.
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DK29579C
(en)
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Closed Underwater audio signal transmitter.
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AT71320B
(en)
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Retractable receiver for underwater sound signals.
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DK15209C
(en)
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Submarine Sound Signal Apparatus.
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AT88431B
(en)
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Receiving device for underwater sound signals.
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FR459501A
(en)
|
|
membrane transmitter for underwater acoustic signals
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FR512131A
(en)
|
|
transmitter for underwater acoustic signals
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FR471873A
(en)
|
|
Receiver for underwater acoustic signals
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AT57783B
(en)
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|
Double hull submarine.
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DK14892C
(en)
|
|
Receiver for submarine audio signals.
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FR451724A
(en)
|
|
Telephone transmitter
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FR16299E
(en)
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Telephone transmitter
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DK13841C
(en)
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Sound transmitter, especially for underwater Signal Devices.
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DK29920C
(en)
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Underwater sound system.
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FR460581A
(en)
|
|
Mobile underwater siren
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FR471562A
(en)
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Microphone transmitter
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FR452068A
(en)
|
|
Megaphone
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DK29827C
(en)
|
|
Receiving device for underwater sound signals.
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FR435892A
(en)
|
|
Underwater auditory signal
|
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DK13935C
(en)
|
|
Submarine Signal Apparatus.
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FR449888A
(en)
|
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Radiotelegraph receiver
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