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| Patents for G01S 3 - Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received (11,105) |
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| 01/27/1976 | US3935539 A-C signal multiplying circuit by a ratio of whole numbers the numerator of which is greater than one and greater than the denominator | | 01/13/1976 | US3932875 Directional antenna | | 01/13/1976 | US3932703 Image motion and change transducers and systems controlled thereby | | 01/06/1976 | US3931607 Array transducer angular tracking system | | 01/06/1976 | US3931515 Radiant energy detection apparatus |
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