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Image: Swartwout patent1

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Description: Swartwout patent 1869
Title: Swartwout patent1
Credit: US patent office
Author: Swartwout patent 1
Permission: http://www.uspto.gov/
Usage Terms: Public domain
License: Public domain
License Link: //en.wikipedia.org/wiki/File:Swartwout_patent1.jpg

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