What specific device is W. A. Martin credited as the African American inventor who patented?

Answer

The modern door lock

W. A. Martin is specifically credited as the African American inventor who patented the modern door lock in 1889. While the concept of locks existed since antiquity, Martin's design represented a significant modernization that set a new standard for securing objects and spaces. This innovation implied an improved function, reliability, or a novel configuration suitable for common residential or commercial use, moving beyond simpler or specialized locks prevalent before that time. This distinction sets his work apart from earlier inventors, positioning his design as foundational to contemporary security standards.

What specific device is W. A. Martin credited as the African American inventor who patented?
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