Key to the classifications of the patent specifications of France, Germany, Austria, Netherlands, Norway, Denmark, Sweden, and Switzerland, in the library of the Patent office.
Edition: 3d ed.
Series: Patent office library series -- no. 1
Publisher: H.M. Stationery off., Darling [printers]
Published: 1915
Place of publication: London
Language: eng
Number of pages: 190
Subjects: Classification -- Books.; Patents -- Europe