https://bertmanballparkmustard.com/
Bertman Original Ball Park Mustard | Since 1925
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https://case.edu/ech/articles/b/bertman-joseph
BERTMAN, JOSEPH | Encyclopedia of Cleveland History | Case Western Reserve University
May 11, 2018 - BERTMAN, JOSEPH (1902-20 Oct. 1988), noted for his Ball Park mustard first used at LEAGUE PARK in the late 1920s and then at CLEVELAND MUNICIPAL STADI...
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