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Thumbnail for Abridgment class and index key, showing abridgment classes and index headings to which inventions are assigned in the official publications of the Patent Office. Vol. 1 [1927]

Abridgment class and index key, showing abridgment classes and index headings to which inventions are assigned in the official publications of the Patent Office. Vol. 1 [1927]

Patent Office1927
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