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US Patent: 187,513
Improvement in bridges
Patentee: Ellery E. Colby (exact or similar names) - Groton, NY USPTO Classifications: 14/13, 14/14, 14/15, 236/68A, 52/639 Tool Categories: manufacturing : manufacturing processes : bridges structures : bridges Assignees: Charles Perrigo - Groton, NY Caleb Bartholomew - Groton, NY Oliver Avery, Jr. - Groton, NY Ellery E. Colby - Groton, NY Manufacturer: Groton Iron Works - Groton, NY Witnesses: Frank Galt Frank H. Duffy	Patent Dates: Applied: Jan. 29, 1877 Granted: Feb. 20, 1877 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Groton Iron Works

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