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Title: A test for defective colour vision, electromechanical counte [Go to resource]
Description: A test for defective colour vision, electromechanical counter in 'home-made' wooden box, 1955-1975. License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Subjects: colour test Temporal: 1955-1975 Source: Science Museum Identifier: 1994-1255/62 Go to resource More Like this...
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