75824955
Oct 18, 1999
Nov 20, 2001
HYDRO-ACOUSTIC POSITIONING AND TELEMETRY INSTRUMENTS HYDRO-ACOUSTIC POSITION REFERENCE EQUIPMENT FOR USE IN THE MARINE-OCEANOGRAPHIC INDUSTRY; MARINE SEISMIC STEAMER POSITIONING EQUIPMENT AND OCEANOGRAPHIC INSTRUMENTS, NAMELY, TELEMETERING TIDEGAUGES AND ACOUSTIC RELEASES
Electrical and Scientific Apparatus