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Title: English 'invisible cemented' bifocal spectacles with oval le [Go to resource]
Description: English 'invisible cemented' bifocal spectacles with oval lenses and round segments. Patent No. 10773, in 1899. License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Subjects: spectacles Temporal: 1899 Source: Science Museum Identifier: 1921-323/193 Go to resource More Like this...
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