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US Patent: 451,720
Steam-engine
Patentee: Henry Bolthoff (exact or similar names) - Denver, CO USPTO Classifications: 91/259, 91/332, 91/333 Tool Categories: propulsion and energy : steam engines : steam engine valves Assignees: None Manufacturer: Hendrie & Bolthoff Manufacturing & Supply CO. - Denver, CO Witnesses: D. E. H. Johnson Philip F. Larner	Patent Dates: Applied: Dec. 09, 1890 Granted: May 05, 1891 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Hendrie & Bolthoff Mfg. & Supply Co.

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