Spacepen
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Spacepen was a 3D tracking product from Science Accessories Corp. available starting circa 1970. It tracks three-dimensional position using a movable spark-gap source and fixed ultrasonic microphones.[1] It operates based on time-of-flight ranging based on the speed of sound in air.[1]
The company's mailing address was 2 Research Drive P.O.Box 825 Shelton CT 06484-0825 USA.[2]