In 1916, Philip Rogers Mallory founded the P.R. Mallory & Co. in Port Chester, New York.  Mallory moved the company’s headquarters to Indianapolis in 1924, where it remained until 1978.  In 1960, Philip passed control of the company to his son, George Barron Mallory.  In 1964, P.R. Mallory & Co. registered the Duracell trademark.