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Why do wiper arms and shafts have so many interfaces (i.e. knurl drum, tapered knurl, DIN)?

April 26, 2017arms DIN Drum interfaces knurl shafts tapered wiper

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Why do wiper arms and shafts have so many interfaces (i.e. knurl drum, tapered knurl, DIN)?

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A. Over the years, the mainstream manufacturers have each developed their own standards for wiper arms. Drum interfaces were popular in 1950s and 1960s automobiles. The tapered knurl is commonly found on many off road applications, as well as larger applications such as motorhomes and busses.