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Dallmeyer's Soft Focus "4.D. Patent" Lens, c....
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Soft-Focus Lens: Dallmeyer-Bergheim No. 2, 18...
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"Triple Achromatic Lens" by J.H. Dallmeyer, c...
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2 Rapid Rectilinear Lenses by Dallmeyer, c. 1...
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J.H. Dallmeyer "Triple Achromatic Lens", 1862...
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