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ROSS' "HOMOCENTRIC" LENSES:
London: Ross Optical Works, [ca. 1914]. 32mo., 21 pp., b&w photographs, diagrams. Printed stiff wrappers, which are slightly dusty. Short tear at base of spine; date in ink on the front wrapper. Very good. Item #29145
A priced catalogue for a variety of lenses with various apertures and focal lengths.
Price: $40.00
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MANUALS & TECHNOLOGY
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