Electric Interlocking Systems General Railway Signal Company Original Patent Lithograph 1933
On this original linen-backed lithograph from 1933 (includes original specification sheet), General Railway Signal Company patented improvements in electric interlocking systems for railways. General Railway Signal Company (GRS) was a supplier of railway signaling equipment, systems and services in the Rochester, New York area. The company was established in 1904 and became part of Alstom Transport in 1998. GRS was a member of the Dow Jones Industrial Average from 1928 to 1930.
All patent lithographs sold by Maymont Group are 100% ORIGINAL.
These documents are NOT reproductions or posters (patent art).
These are the original lithographs found in books obtained from the Patent and Trademark Office directly.
In the 1800's and early 1900's, inventors would submit a detailed drawing of the invention and/or improvements to the patent and trademark office. Once received and if approved, the Patent office would then send a letter of confirmation to the inventor and begin to take that drawing and etch it into stone in order to create and print this linen-backed lithograph. These documents are the original hard copies that were created by the patent office's artists, and act as patent examiner reference material. With that being said, these are 100% original and are the only physical copies in existence.
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