Patent:US3481452

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Brevetto:US 3481452
Titolo:PICKIOS DRAFTSMAN KIT
Data:01.12.1969
Luogo:Jamaica (N.Y.)
Nazione:Stati Uniti
Persona:Anthony G. Pickios
Ditta:
Link interni:Fraction of an Inch Adding Machine and FractronCalculator.jpg
Keywords:
Link al brevetto:
(without guarantee)
 US3481452 (http://v3.espacenet.com/textdoc?DB=EPODOC&F=0&IDX=US3481452) (espacenet),  US3481452 (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=3481452.PN.&OS=PN/3481452&RS=PN/3481452) (uspto)


In order for the draftsman to make convenient and quick conversions of the numerical fractions, such as half inch, quarter inch measurements, etc., to whole numbers, a fractional calculator may also be provided on the lower portion of the frame means

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Ultima modifica il 12:39, 24. Giu 2009.