Image: Gustav R. Paalen, Double Welled Vessel 1909
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Description: Gustav Robert Paalen, Double Walled Vessel, 1. Patent June 27, 1908, published July 13th 1909
Title: Gustav R. Paalen, Double Welled Vessel 1909
Credit: http://www.google.com.na/patents/US928002
Author: Gustav Robert Paalen
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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