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© 1966 Optical Society of America
C. Shepard, "Patent Reviews: 3,164,662; 3,170,980; 3,172,941; 3,173,985; 3,190,172; 3,191,490; 3,191,493; 3,227,042; 3,227,041; 3,236,151; 3,237,520; 3,240,120; 3,241,442; 3,241,443; 3,244,073; 3,244,074; 3,246,563; 3,247,764; 3,249,008; 3,249,009," Appl. Opt. 5, 1312-1318 (1966)
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