The first twenty-five years of the international patent classification : 1971-1996 / World Intellectual Property Organization
Medverkande: World Intellectual Property Organization [pbl].
Materialtyp:
BokSerie: WIPO publication, 885(E). Förläggare: Geneva : WIPO, 1996Beskrivning: 33 s. : ill., tab.ISBN: 9280506250.Ämnen: Patentklasser | IPC | Patent classification
