Comparison between Survey map by 14.5kc Fish-finder and that by 200kc Fish-finder with Sharp Beam on Same sea
14.5kc魚群探知機と、尖鋭ビームを有する200kc魚群探知機による同一海面に於ける測量図の対比(日本航海学会第19回講演会) release_kdabz52llvautl6lxxjnegdtom

by T. Hashimoto, Y. Maniwa