- U.S. Patent 3,139,753 Digital Meter (1962)
- U.S. Patent 3,408,749 Branching-Instruction Teaching Device (1968)
- U.S. Patent 3,504,446 Comparator Switch Set (1970)
- U.S. Patent 3,504,447 Student Keyboard (1970)
- U.S. Patent 3,654,708 Computer-Assisted Instruction Via Video Telephone (1972)
Monday, April 21, 2008
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