James Leonard Plimpton

 James Leonard Plimpton (1828, Medfield, Massachusetts - 1911) was an American inventor who is known for changing the skating world with his patented roller skates in 1863. Plimpton's roller skates were safer and easier to use than the existing versions, his "rocker skates" or quad skates allowed people to steer just by leaning to the left or the right. He also opened some of the earliest roller skating rinks in New York City and Newport, Rhode Island. In addition to opening the first, official, roller skating rink he also established the first roller skating club, that included rules of roller skating rink conduct, with how to roller skate lessons, and proficiency tests for skaters to plot their progress. 

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John Joseph Merlin

John Joseph Merlin (born Jean-Joseph Merlin, 6 September 1735 – 8 May 1803) was a Walloon from the Prince-Bishopric of Liège in the Holy Roman Empire. He was a Freemason, clock-maker, musical-instrument maker, and inventor.^[2][3][4] He moved to England in 1760. By 1766 he was working with James Cox and creating automatons such as Cox's timepiece and the Silver Swan. By 1773 he was designing and making innovative keyboard instruments.^[2] In 1783 he opened Merlin's Mechanical Museum in Princes Street, Hanover Square, London, a meeting-place for the gentry and nobility.^[2][5][6][7] In addition to his clocks, musical instruments and automata, Merlin is credited with the invention of inline skates in the 1760s. He was referred to by contemporaries as "The Ingenious Mechanic". He was friendly with composer Joseph Haydn.^[4][8]