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Title: 12 change wheels [Go to resource]
Description: 12 change wheels. Nos of teeth : 40, 45, 50, 51, 55, 60 (brass), 65, 70, 74, 78 (on machine), 80, 84 License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Source: Science Museum Identifier: 1928-1219/4 Go to resource More Like this...
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