Patent:US621589

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Patent:US 621589
Title:Perpetual calendar
Date:21.03.1899
Place:Summit, NJ
Country:USA
Person:Vernon, Richard R.
Company:
Internal Links:
Keywords:
Link to the patent office:
(without guarantee)
 US621589 (http://v3.espacenet.com/textdoc?DB=EPODOC&F=0&IDX=US621589) (espacenet),  US621589 (http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=/netahtml/FPTO/srchnum.htm&r=1&f=G&l=50&s1=621589.PN.&OS=PN/621589&RS=PN/621589) (uspto)


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