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Barrett Sub-Normal Vision Monocular and Testing Set
London Optical Company
20th c.
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Barrett Sub-Normal Vision Monocular and Testing Set
London Optical Co; Levers Optical Co Ltd
20th c.
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Lederer microscopes
c.1953-1954
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Lederer-type microscopes (Stigmagna lenses)
Stigmat Ltd
Late 1950s
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microscopes (hyperoculars)
Combined Optical Industries Ltd
c.1956
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