Of this type, the best known are the" Hughes Recording Echo Sounder," and the Marconi" Seagraph " depth recorder and" Seaview" depth indicator.
Yale ntlobo, ezona zaziwayo 'zizishicileli zentlokoma sandi zikaHughes kwakunye nezazobe solwandle sikaMarconi' umbhali wobunzulu kwakunye nombonisi wobunzulu kwimboniselo yolwandle.