Labelled Patent Specifications

Scope and Content

Includes Patent numbers: 620,796 (1949); 645,464 (1950); 647,191 (1950); 647,207 (1950); 647,365 (1950); 651,035 (1951); 680,167 (1952); 723,523 (1955).
Some American patents specifications.

Additional Information

Published