Patent model for Alexander W. Brinkerhoff, “Rectal Speculum,” U.S. Patent 224,991 (March 2, 1880). Brinkerhoff (1821-1887) was an inventive entrepreneur in Upper Sandusky, Ohio.
Ref: Alexander W. Brinkerhoff, Diseases of the Rectum and New Method of Rectal Treatment (Columbus, Ohio, 1881).
Jacob Dissinger Albright, A Practical Treatise on Rectal Diseases (Philadelphia, 1909), p. 65.
Joe Terry, “I’ll take Patent Potpourri for a Thousand, Alex,” Bottles and Extras (Spring 2006): 58-62.
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