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Das deutsche Patentwesen : Rückschau und Ausblick
Kirchhoff, Heinrich, (1947)
A survey of the principal national patent systems
Vojáček, Jan, (1936)
Patents : what a business executive should know about patents
Hoar, Roger Sherman, (1927)
The tariff manual
Hoar, Roger Sherman, (1917)
Unemployment insurance in Wisconsin
Hoar, Roger Sherman, (1932)