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© 1966 Optical Society of America
C. Shepard, "Patent Reviews: 3,145,251; 3,149,228; 3,151,521; 3,158,675; 3,159,707; 3,189,471; 3,191,045; 3,193,400; 3,205,774; 3,209,649; 3,212,400; 3,215,037; 3,216,319; 3,217,596; 3,217,597; 3,217,598; 3,220,307; 3,220,308; 3,220,309; 3,221,601; 3,224,330; 3,224,331; 3,224,332," Appl. Opt. 5, 712-716 (1966)
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