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US Patent: 205,982
Improvement in rotary valves
Patentee: Frank M. Stevens (exact or similar names) - Concord, NH USPTO Classifications: 137/625.32 Tool Categories: propulsion and energy : steam engines : steam engine valves Assignees: None Manufacturer: Not known to have been produced Witnesses: Frederick H. Gould Frederick F. Brown	Patent Dates: Applied: Oct. 09, 1877 Granted: Jul. 16, 1878 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for D. C. Allen & Co.
Description: Of interest because Frank M. Stevens took over woodworking machinery maker D. C. Allen & Co. before selling to John A. White.

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