Piper & Tinker was a short-lived automobile brand associated with John W. Piper and George M. Tinker, active in Waltham, Massachusetts, between 1899 and 1900. The exact number of vehicles produced under this name remains uncertain. Both men were employed by Charles Herman Metz's Waltham Manufacturing Company. With their employer's permission, they used a back room of the factory to build their first steam car, which they named Waltham out…