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http://www.google.ca/patents/US3787124?utm_source=gb-gplus-share
Patent US3787124 - DUAL WAVELENGTH PHOTOMETER FOR
DUAL WAVELENGTH PHOTOMETER FOR
George W. Lowy et al
Overview
Abstract
Drawings
Description
Claims
Patent number
: 3787124
Filing date
: 21 Sep 1972
Issue date
: 1974
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