Gyroscopes; Seismographs; Tachometers; Apparatus for recording, transmission and reproduction of images; Apparatus for transmission of communication; Azimuth instruments; Compasses for measuring; Directional compasses; Distance measuring apparatus; Electric coils; Electric navigational instruments; Electric sensors; Electrical transducers; Electro-optic transducers; Electronic coils; Electronic detectors for observing and measuring the infrared spectrum, namely, infrared detectors; Global pos...