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Amsler polar planimeter

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[Amsler polar planimeter]

cc-by-sa/3.0
License: cc-by-sa/3.0 (500 x 258 px) (6904 bytes)
Title: Amsler polar planimeter
Taken by: Nol Aders from Wikimedia Commons (original source)
Topic: Planimeter [W][FB][DBp]

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