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US1581202A
|
|
Means for mounting diaphragms
|
|
US1588358A
|
|
Sound-receiving equipment for ships
|
|
US1555366A
|
|
Electromagnetic sounding apparatus with two exciting windings
|
|
US1520291A
|
|
Transmitting and receiving device for submarine sound waves
|
|
US1604041A
|
|
Device for regulating the amplitudes and damping in sound apparatus
|
|
US1539792A
|
|
Submarine sound transmitter
|
|
US1451422A
|
|
Sound signaling device for dense sound-propagating mediums
|
|
US1715344A
|
|
Arrangement for eliminating disturbances in sound signaling
|
|
US1590369A
|
|
Device for preventing undesired vibrations in sound signaling apparatus
|
|
US1503599A
|
|
Protective device in sound-signaling apparatus
|
|
US1553771A
|
|
Device for assisting navigation
|
|
US1557048A
|
|
Vibration apparatus, particularly for receiving and producing sound waves
|
|
US1667418A
|
|
Subaqueous sound-signaling apparatus
|
|
US1611740A
|
|
Submarine sound producer
|
|
US1604693A
|
|
Means for signaling under water
|
|
US1563626A
|
|
Sound-signaling device
|
|
US1577741A
|
|
Electromagnetic sound apparatus
|
|
US1670888A
|
|
Submarine sound receiver
|
|
US1463911A
|
|
Sound producer and receiver
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