How does Martin's modern door lock invention differ from Isaac H. Vaughan's patent in 1901?
Answer
Vaughan patented an improvement to the lock, whereas Martin focused on the fundamental device
The text draws a subtle but important distinction between the two inventors' work regarding lock technology. W. A. Martin’s 1889 patent focused on establishing the fundamental design of the *modern door lock* of that era, setting a new benchmark for protection. In contrast, Isaac H. Vaughan patented an *improvement* to the lock mechanism in 1901. This indicates that Martin’s contribution was earlier and more foundational to the standard of security, while Vaughan's work represented a refinement or enhancement to the existing system that Martin helped establish.
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