4. Communications, electrical: acoustic wave systems and devices
  5. Echo systems
  6. Distance or direction finding

Robert Halley

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Detection and classification for multi-beam sonar systems

Communications – electrical: acoustic wave systems and devices – Echo systems – Distance or direction finding
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Single handed set-up apparatus

Geometrical instruments – Miscellaneous – Light direction
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Profile ID: LFUS-PAI-P-776288

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