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Title: [Go to resource]
Description: Metal and enamel(?) trial frame, adjustable ear and nose pieces, rotating cells and bar for adjusting to pupil width, all graduated, English(?), 1900-1940 License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Subjects: trial frames Temporal: 1900-1940 Source: Science Museum Identifier: A680908 Go to resource More Like this...
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