Patents for Inventions: Abridgments of Specifications Relating to the Preparation of India-Rubber and Gutta Percha; A. D. 1791-1866 (Classic Reprint) - Hardcover

Inhaltsangabe

Excerpt from Patents for Inventions: Abridgments of Specifications Relating to the Preparation of India-Rubber and Gutta Percha; A. D. 1791-1866

The Indexes to Patents are now so numerous and costly as to render their purchase inconvenient to a large number of inventors and others, to whom they have become indispensable.

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