- - Echo-sounding device
- - Sonar device
- - Antisubmarine device.
- - British submarine detection device.
- - Early form of sonar used to detect submarines
- - For Christmas Dick got some detection system
- - Early sonar used to detect submarines
- - Sonar, an echo-sounder
- - Sonar, to Brits
- - Early sonar, to Brits
- - Sonar
- - Sonar in Soho
- - Sonar, in England
- - British sub-detection apparatus
- - Sonar, British style.
- - British sonar.
- - Echo sounder
- - early form of sonar developed by the british between the two world wars
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