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Device for position determination
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Method for measuring the area of the bottoms of waters by means of echo sounding
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Recording device for echo sounders
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Position-finding system in waterways
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Data recording in hydrographic surveying
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Anchoring system
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Pressure sensor for water level measurements
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Echo sounding device with documentation of the calibration
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Echo sounding device for sediment representation
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Echo sounding device comprising digitisation of the measurement results
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Periodically acting brake system for vehicles
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Recording device for echo sounders and other short-time measuring instruments
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Echo sounding method for measuring water level and waves from the bottom of waters
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Water level and wave meter eliminates spurious echoes - using sea-bed press. measurements if echo sounding path is disturbed
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Sonar equipment for vessel measuring velocity distribution - sounds depth vertically and at angle and computes effective geometric angle
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