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Title: [Go to resource]
Description: Circular trial lens, for 'cone muscular test', made by Down Bros Limited, 21-23 St. Thomas's Street, London, England, 1920-1930. License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Subjects: trial lenses Temporal: 1920-1930 Source: Science Museum Creator: Down Bros Limited (maker) Identifier: A680606 Go to resource More Like this...
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