Which barstool was designed in 1859?

Screen shot 2012-05-02 at 11.47.44 AM
The barstools shown above span 141 years of design. Can you guess which one was designed first or which was designed last? Here is each name and year of design: (from left to right) Tractor Barstool (2000); Tolix Marais Barstool (1934); LEM Piston Stool (2000); Era Barstool (1859).