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American Engineer's Optical Tilting Level, Keufel and Esser, c.1930, x 12.8 in — 16 x 32.5 cm
American Engineer's Optical Tilting Level, Keufel and Esser, c.1930serial no. 162750, x 12.8 in — 16 x 32.5 cmProvenance:Collection of Thomas Pock...
Ophthalmologist's 'Lensometer', American Optical Company, c., maximum 15 x 19 in — 38.1 x 48.3 cm
Ophthalmologist's 'Lensometer', American Optical Company, c.maximum 15 x 19 in — 38.1 x 48.3 cmProvenance:Collection of Thomas Pocklington (Essex,...