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| US4277133 | 22 Mar 1979 | 7 Jul 1981 | Western Publishing Company | Microscope |
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| US4664486 | 12 Jan 1983 | 12 May 1987 | | Variable magnification endoscope |
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| US4704007 | 30 Mar 1983 | 3 Nov 1987 | | Variable magnification endoscope |
