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Title: Selected segment of calculated high density, ground flat on [Go to resource]
Description: Selected segment of calculated high density, ground flat on one face and curved on the other. Stage in the manufacture of 'Kryptok' bi-focal spectacle lenses. License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Subjects: ophthalmic lens Source: Science Museum Identifier: 1921-323/56 Go to resource More Like this...
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