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