You can see all the US patents on the net - very interesting!
This is the very first
http://patimg1.uspto.gov/.piw?Docid=00000001&homeurl=http%3A%2F%2Fpatft.uspto.gov%2Fnetacgi%2Fnph-Parser%3FSect1%3DPTO1%2526Sect2%3DHITOFF%2526d%3DPALL%2526p%3D1%2526u%3D%25252Fnetahtml%25252FPTO%25252Fsrchnum.htm%2526r%3D1%2526f%3DG%2526l%3D50%2526s1%3D0000001.PN.%2526OS%3DPN%2F0000001%2526RS%3DPN%2F0000001&PageNum=&Rtype=&SectionNum=&idkey=NONE&Input=View+first+page
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