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David (2008). Patent it yourself (13th ed.). Nolo. p. 313. ISBN 978-1-4133-0854-9. "Wir haben ein Auge darauf" [We keep an eye thereon]. Tageblatt Lëtzebuerg...

Patent It Yourself (13, illustrated, revised ed.). Nolo. p. 99. ISBN 978-1-4133-0854-9. "Manual of Patent Practice" (PDF). United Kingdom Patent Office....