Word: benchwork
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Dates: during 1958-1958
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...This is for middle distance-3 to 25 ft. At the top is a thick oval lens, apres Fresnel, with three-power magnification for distance-"infinity," which begins at 25 ft. At the bottom is a similar lens with magnification of 3 to 20 diameters for reading, sewing or benchwork. Cost of the three-in-one lighthouse...
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