Three Early Patent Models and a Hydraulic Pressure Apparatus, 19th/20th century, "Improvement on Lock Nuts," Frederick Oakley, no. 93,943, August 17, 1869, with original patent label, maple block with

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Three Early Patent Models and a Hydraulic Pressure Apparatus, 19th/20th century, "Improvement on Lock Nuts," Frederick Oakley, no. 93,943, August 17, 1869, with original patent label, maple block with lock nut examples and signed "Fredk Oakley August 1869"; "Improvement in Soldering Apparatus," Fayette. S. Robinson, no. 200,875, March 5, 1878,...

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