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Priority claimed from US05/410,676external-prioritypatent/US4042906A/en
Priority claimed from US05/410,938external-prioritypatent/US4086504A/en
Application filed by Texas Instruments IncfiledCriticalTexas Instruments Inc
Publication of BR7409041D0publicationCriticalpatent/BR7409041D0/en
Method of and apparatus for the generation and transmission of signals for echolocation and other signalling purposes, such as in geophysical exploration