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Private Eye (Advanced Technology Security Filter), Eyesaver International, Inc., Hingham, Massachusetts undated. |
Optical Systems Light Control Film, from 3M; undated. |
"A device that provides an eye-to-eye video perspective for interactive television", by A. Rodney Wellens, Behavior Research Methods & Instrumentation, 1978, vol. 10 (1), pp. 25-26. |