## Original 1925 United States Patent Letters Document – Locomotive Railroad Technology
**Inventor:** Henry K. Adams of Nashville, Tennessee
**Patent Number:** 1540870
**Issue Date:** June 9, 1925
**Invention:** Power Reverse Mechanisms for Locomotives
### Item Overview
Available for purchase is a magnificent, completely original piece of 1920s railroad engineering history. This official United States Patent Office document grants the letters patent to Henry K. Adams for his innovative "Power Reverse Mechanisms for Locomotives."
This is a complete package including all drawings and descriptions.
This is the actual legal artifact issued directly by the government, complete with its original eyelet-punched vibrant blue ribbon, textured dark red legal wafer seal ("Patent Office United States of America"), and an incredibly detailed, ornate engraved header featuring a vignette of the U.S. Patent Office building in Washington, D.C.
The document is signed by Law Examiner G. P. Tucker and Commissioner of Patents Thomas E. Robertson. It grants the exclusive rights for a term of seventeen years.
### Condition & Preservation
* Excellent vintage condition given its century-old age.
* Displaying expected light corner wear, minimal aging, and authentic crispness to the legal parchment stock.
* Perfect for framing, library display, or addition to an elite railroadiana / locomotive history collection.
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### 🚂 Historical Cross-Reference / Collector Note
Please note that the inventor, Henry K. Adams, actively advanced locomotive valve gear mechanics during this era. I am concurrently listing his second closely-related patent: **U.S. Patent No. 1,515,133 (1924) for "Lead Control Mechanism for Engines"** (specifically focusing on Walschaert valve gear optimization).
If you are a specialized steam train or mechanical engineering collector, please check my other listings to view the companion 1924 technical specification book and schematics. They complement each other beautifully as a chronological timeline of early 20th-century Southern industrial design.
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