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Title: A set of change wheels,teeth numbers being- 21, 23, 24, 25, [Go to resource]
Description: A set of change wheels,teeth numbers being- 21, 23, 24, 25, 30, two of 40, and 45 to 85 in 5 teeth steps and a 100 tooth wheel all mounted on a stand. License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Source: Science Museum Identifier: 1973-237/7 Go to resource More Like this...
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