United States Patent 7 Rea 11 Patent Number 45 Date of Patent 4 962 425 Oct 9 1990 54 PHOTOMETRIC DEVICE 75 Inventor Mark S Rea Orleans Canada 73 Assignee National Research Council of Canada Conseil National deResherches Canada Ottawa Canada 21 Appl No 263 023 22 Filed Oct 27 1988 51 Tnt Ce HO4N 17 00 1521 US CM 358 139 358 163 358 168 358 169 358 903 58 Field of Search 358 139 163 168 169 358 903
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