Patent:US4416633

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Brevetto:US 4416633
Titolo:Educational and recreational mathematical device in the form of a band,
Data:22.11.1983
Luogo:880 Fifth Ave., New York, NY 10021
Nazione:Stati Uniti
Persona:Gulack, Max A.
Ditta:
Link interni:Lehrmittel
Keywords:
Link al brevetto:
(without guarantee)
 US4416633 (http://v3.espacenet.com/textdoc?DB=EPODOC&F=0&IDX=US4416633) (espacenet),  US4416633 (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=4416633.PN.&OS=PN/4416633&RS=PN/4416633) (uspto)


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Ultima modifica il 17:10, 19. Ott 2008.