Patent:US1989223

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Patent:US 1989223
Title:Graphic calculating device
Date:29.01.1935
Place:Cleveland (OH), USA
Country:USA
Person:Barr, John M.
Company:The Integraph Company
Internal Links:Nomogramm, Barr Integraph, Planimeter, Analogrechner, Integraph
Keywords:
Link to the patent office:
(without guarantee)
 US1989223 (http://v3.espacenet.com/textdoc?DB=EPODOC&F=0&IDX=US1989223) (espacenet),  US1989223 (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=1989223.PN.&OS=PN/1989223&RS=PN/1989223) (uspto)


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