U.S. federal trademark · Serial No. 72372791 · Reg. No. 0917652
PHOTOGRAPHIC FLASHERS, SIGHTING DEVICES HAVING PROTRACTOR SCALES AND PLUMB LINES FOR LOCATING THE POSITION OF CELESTIAL BODIES, OSCILLATORS, PHOTOEFFECT APPARATUS COMPRISING PHOTOSENSITIVE VACUUM TUBES AND CIRCUITRY DESIGNED TO DEMONSTRATE EFFECTS OF LIGHT ON SURFACE, PULSE DIVIDERS, AND APPARATUS FOR COUNTING ELECTRONIC PULSES
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