John A. Miller

[5] In 1910, Miller designed a device that prevented cars from rolling backward down the lift hill in the event of pull chain breakage.

[5] Besides patenting ingenious inventions for coasters—including several types of brakes and car bar locks—Miller built his share of unusual "scream machines".

Characteristics of their roller coasters are camelback hills (multiple straight or slightly angled drops that went all the way to the ground) and large, flat turns.

In addition to coasters, the firm constructed mill chutes and domed roof buildings for carousels and dance pavilions.

The legendary Cyclone (1928–1958) at Puritas Springs near Cleveland, Ohio, was honored with a place on the Smithsonian Institution's list of Great Lost Roller Coasters.

A roller coaster wheel assembly. The underfriction wheels are on the bottom. The three sets of wheels clamp onto the track.