Henry E. Leman was a gun smith and manufacturer that built his business called Conestoga Rifle Works on the Conestoga River in Lancaster County, Pennsylvania in 1837.  Over the following two decades, Leman's Conestoga Rifle Works became a well known maker of sporting rifles and Indian trade arms.  In 1860 Leman had 62 employees and manufactured 5,000 rifles.  He also altered more than 14,000 flintlock arms to percussion for the state of Pennsylvania during the Civil War.  George Moller, American Military Shoulder Arms, Vol III