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Year Event
1899 the company is founded by George H. Williamson in Janesville
1906 Riccardo Amisani begins[1]his Williamson reseller activity
1923 Riccardo Amisani registers Williamson trademark
1951 the company ceases operations
  1. referring to a flyer of this year that shows Riccardo Amisani as general representative for Italy and colonies.