Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Publication of BE560043ApublicationCriticalpatent/BE560043A/xx
Priority claimed from GB2475756Aexternal-prioritypatent/GB816119A/en
H03K25/00—Pulse counters with step-by-step integration and static storage; Analogous frequency dividers
G—PHYSICS
G01—MEASURING; TESTING
G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
G01S15/88—Sonar systems specially adapted for specific applications
G01S15/96—Sonar systems specially adapted for specific applications for locating fish