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http://www.google.com.au/patents/US2850940?utm_source=gb-gplus-share
Patent US2850940 - DEVICE TO MEASURE REFRACTIVE INDEX GRADIENT
DEVICE TO MEASURE REFRACTIVE INDEX GRADIENT
Kurt W. Opperman et al
Overview
Abstract
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Description
Claims
Patent number
: 2850940
Filing date
: 28 Apr 1955
Issue date
: 9 Sep 1958
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