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A method and device for detecting physical bottom contact for objects on a sea bottom
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Laser warning device for indicating receipt of laser radiation
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Apparatus for the transmission of electrical signals on a fishing net
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Apparatus for gauging the catch within a trawl net
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Electroacoustic transducers for doppler velocity measurement
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Methods of and apparatus for drawing sonar echo signals on display screens
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Method and means for erasing recordings on magnetic paper, particularly for distance measuring equipment
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PROCEDURES AND ARRANGEMENT IN CONNECTION WITH REGISTRATION DEVICES
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PROCEDURE AND ARRANGEMENT FOR USE IN CONNECTION WITH REGISTERS
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RECORDER FOR SOUND SOUNDERS OR SONAR DEVICES
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Echo sounder systems utilizing non-linear acoustic signal interaction
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PROCEDURE FOR INFORMATION REGISTRATION
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ECHO SIMULATOR TESTER
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Instruments for testing laser rangefinders
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Device for adjusting the timing of the transmission of pulses of energy by distance measuring equipment
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Echo sounding apparatus with automatically regulated receiver gain
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Apparatus for aiming a pelagic trawl at a shoal of fish
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Methods and apparatus for signal recording on electrolytic paper
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Recording apparatus for sonar and echo sounding systems
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An apparatus for storage and delayed recording of echo signals
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