A company that was founded back in 1839 the company continues to sell its machinery and provide jobs for people worldwide.  I am unsure how many changes the logo has undergone but the most recent logo was designed by Landor Associates in 2000.  Even though the logo may have changed over the years the brand is still very recognizable and alteration to the logo probably hasn't effected the popularity of the company.  While putting the logotype perfectly centered below the logo may not have been the best choice I do like the deer illustration.

info from -  http://famouslogos.net/john-deere-logo/