Design patent # D4,116, June 7, 1870 by Joseph A. Ruff. Assigned to Metallic Compression Casting Co. assignor to Russell & Erwin. Sold in Russell & Erwin's 1875 catalog for $3.50/ pair. Shown in August 1871 Supplement to 1870 Russell & Erwin catalog page 3 and 1875 catalog page 385.