Keywords: FMIB 38286 Churns, with buttons receiving polish by the use of acid and steam Note the funnels from which acid solution drips into the.jpeg check categories 26 August 2015 2 Churns with buttons receiving polish by the use of acid and steam Note the funnels from which acid solution drips into the churns Subject Pearl button industry--Equipment and supplies Tag Shellfish 1921 Cite book Fresh-water Mussels and Mussel Industries of the United States Coker Robert E Washington DC Government Printing Office 1921 Bulletin of the United States Bureau of Fisheries vol 36 1917-1918 Plate XL-1 Creator Robert Ervin Coker PD-UWASH-FMIB Institution University of Washington FMIB-source accession number 38286 Images from the Freshwater and Marine Image Bank to check Robert Ervin Coker Shell buttons |