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Aaron Hatfield – Complete Biography, History, and Inventions

Aaron Hatfield was a watchmaker and inventor, most famously known for the Hatfield adder. The Hatfield adder was a circular adding device made from three concentric brass discs and a lever set on a wooden paddle.

Early Life

Little is known about his early life, but Aaron was born in Pennsylvania in 1819. 

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Hatfield also took three US patents on pruning shears, pumps, and an improvement on bag holders in his lifetime, depicting his ability to dabble with different trades with varying success.

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Career

The 1850 US Census details him as a watchmaker, though he added a few skills over the years. In the 1860 US Census, Hatfield moved to Sandusky, Ohio, and worked as a photographer (ambrotypist).

What Did Aaron Hatfield Invent? What is He Known For?

Hatfield is known for three patents, but the adding machine is the most popular. It had a number of metallic disks with numbers stamped and set with springs.

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