Thanks to all who replied. Isaac M. Fronk was in Cambria County in 1920 census, listed as a house carpenter. At some point I think he moved back to western PA, was buried near Cherry Tree, Indiana County. Not sure how long he worked in or what he did in the silk mill. Also Trying to find links farther back in the Fronk Family. The ones that left Perry in 1850 to head to Cambria may have ties to the Fronks who stayed in the Mifflin-Juniata area. Marcia Fronk