technics, machines, drop hammer of Billings and Spencer, Hartford, Conneticut, wood engraving, late 19th century, industry, metal forging, engine, mechanical engineering, USA, historic, historical,

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Photo credit: © INTERFOTO / History / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: billings, conneticut, drop, engine, engineering, forging, hammer, hartford, industry, machines, mechanical, metal, spencer, technics