| http://www.w3.org/ns/prov#value | - The device comprises two sets of transducers and transmitting and... 37 4216537 Sonar for the topographic representation of a submerged surface and underlying strata This sonar system, placed on a vehicle such as a ship or a submarine, comprises transducer means for transmitting and receiving acoustic waves at two different frequencies, said reception means... 38 4138657 Shipboard apparatus for me
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