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John A. Miller was an American inventor and engineer best known for his roller coaster designs, safety features, and other amusement attractions.

His work earned him the nickname of the "Father of the Modern High Speed Coaster".

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Two of his over 100 inventions, namely the Upstop or under friction wheels and anti-rollback devices found on nearly all roller coasters today are some of the most significant developments in the history of the amusement industry to date.

Career

Born in 1872 as August John Mueller, he began his career at age 19 under the direction of LaMArcus Thompson, helping design the LA Thompson Scenic Railway concept which lead to the development of what we know as a roller coaster today.

Eventually Miller became the chief engineer of the company.^[1][2]

Following his invention of the under friction or upstop wheel system in 1910, John began to consult with the Philadelphia Toboggan Company in 1911.

John's under friction wheels provided the ab