Herman Livingston Collyer (1857-1923), a New York gynecologist, introduced this type of pelvimenter in 1894. The “P.S.M.CO.” inscription probably refers to the Penn Surgical Manufacturing Co. of Philadelphia, a firm founded in 1906.
Ref: Herman L. Collyer. “A Pocket Pelvimeter,” Medical Record 46 (1894): 297.
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