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United States Patent Dates & Numbers 1836-1990

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  • Posted By: Tom Norskov
  • Posted: March 9, 2011
  • Last Updated: May 21, 2011
  • Views: 1078
  • Category: Online Resources » Other
  • Description: U.S. Patent numbers chart for dating antiques & collectibles from 1836 to 1990. An amazing variety of 19th & 20th century American antiques, jewelry and collectibles are marked with the patent number identifying the year that the object was patented.

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