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AnonymousGoogle searches for "yuengling ice cream" and "tharp's ice cream" give websites for the Yuengling Brewery of Pottsville, PA which in the 1920s opened a dairy and sold ice cream, and a website for a company named Tharp's Food Technology which states that the founder's family sold Tharp's Ice Cream in the '20s. According to Old Cardboard, Yuengling Ice Cream cards were issued in Pottsville, PA, so this is likely the same Yuengling. Maybe someone at one of these companies can help?
http://www.brucetharp.com/about.htm
http://www.beerhistory.com/library/holdings/yuengling.shtml
http://www.yuengling.com/faq.htm