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Submission + - U. S. Patent Anniversary

Ophion writes: July 31, 1790 — The U.S. Patent Office opened for business and granted the first U.S. patent (TIFF plugin required) to Samuel Hopkins of Philadelphia for "making pot and pearl ashes," a cleaning formula used in soapmaking. The patent was signed by both George Washington and Thomas Jefferson.
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U. S. Patent Anniversary

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Be careful when a loop exits to the same place from side and bottom.