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[Y] (WILLIAMS ELI [US]) [Y] 1-7 * column 4, line 29 - column 6, line 41; figures 4-6,8 *; | Type: | Patent literature | Publication No.: | US5447494
[Y] (DORSEY III JAMES H [US]) [Y] 1-7 * column 5, lines 10-55; figures 1-7 *; | Type: | Patent literature | Publication No.: | US4534758
[Y] (AKERS MICHAEL J [US], et al) [Y] 1-7 * column 7, lines 22-37; figures 9,10 *; | Type: | Patent literature | Publication No.: | EP0135991
[Y] (BARR RICHARD HENRY HOWARD) [Y] 4-6 * page 5, line 25 - page 6, line 15; figure 1 *; | Type: | Patent literature | Publication No.: | US5360407
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[Y] (ASAHI OPTICAL CO LTD); | Type: | Patent literature | Publication No.: | JPS63246133
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