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Archibald George Downie
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3326. Downie, A. G. Feb. 14. Orthoptics. - Orthoptic spectacles comprise a sliding frame B adjustably fitted to a frame A and a sliding sighting-tube C arranged on the frame B. D is the eccentric disk with apertures of different sizes. This device can be used for either right or left shoulder shooting.
GB190803326D1908-02-141908-02-14Improvements in Orthoptics
ExpiredGB190803326A
(en)