Trade Card for Warner's Safe Yeast, H.H. Warner & Co., circa 1885

Hulbert Harrington Warner, a wealthy fire- and burglar-proof safe manufacturer, purchased medicinal formulas in the late 1800s and turned them into a multi-million-dollar patent medicine business. He also made and sold yeast. Warner advertised these products as "safe," alluding to his original business and his product's perceived quality. In the mid-1880s, he built a massive office building in Rochester, New York, for his growing operations.