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nph-Parser?patentnumber=7417993
nph-Parser?patentnumber=7417993
http://patft.uspto.gov/netacgi/nph-Parser?patentnumber=7417993
Ivan Sutherland
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nph-Parser?patentnumber=7417993
http://patft.uspto.gov/netacgi/nph-Parser?patentnumber=7417993