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Title: Parkson Gear Tester using rolling action of meshed pair of g [Go to resource]
Description: Parkson Gear Tester using rolling action of meshed pair of gears to check centres, and compare with standard, made between 1940 and 1945 License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Temporal: 1940-1945 Source: Science Museum Creator: Parkson (maker) Identifier: 1993-1535 Go to resource More Like this...
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