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Title: Oval white 'Kryptok' fused bi-focal spectacle lens with grou [Go to resource]
Description: Oval white 'Kryptok' fused bi-focal spectacle lens with ground edges, separation impossible, Patent No. 18158, AD 1904. License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Subjects: ophthalmic lens Temporal: 1904 Source: Science Museum Identifier: http://collectionsonline.nmsi.ac.uk/grab... Go to resource More Like this...
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