from: Riding Vintage: “Harley started producing motorcycles for police departments just five years after they built their first motorcycle in 1903. Advancements were slow at first, but in the 1930’s Harley’s engineers began developing the accessories that are normally associated with modern police motorcycles. See pictures of the evolution of police HD’s through the 1930’s here: http://www.ridingvintage.com/2013/10/harley-davidsons-advances-in-police.html”
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