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© 1962 Optical Society of America
C. Shepard, R. Anwyl, G. W. Cleek, A. Danti, J. Fitzmaurice, W. L. Hyde, R. Kingslake, D. J. Lovell, D. L. MacAdam, A. Mann, T. K. McCubbin, R. K. McDonald, J. R. Meyer-Arendt, G. W. Stroke, and D. E. Williamson, "Patent Reviews: 3,015,988; 3,016,798; 3,016,799; 3,018,688; 3,018,689; 3,020,804," Appl. Opt. 1, 248-248 (1962)
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