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Title: Ratchet wheel provided with two ratchets, pawl and half pawl [Go to resource]
Description: Ratchet wheel provided with two ratchets, pawl and half pawl, teaching model / J Schr�der, Germany, 1868 License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Subjects: ratchet wheel Temporal: 1868 Source: Science Museum Creator: Schr�der, J Identifier: 1868-175 Go to resource More Like this...
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