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US Patent: 155,093
Improvement in steam-boilers
Patentee: John L. Knowlton (exact or similar names) - Sharon Hill, PA USPTO Classifications: 122/118 Tool Categories: propulsion and energy : steam apparatus : stationary boilers Assignees: None Manufacturer: Not known to have been produced Witnesses: James L. Ewin Octavius Knight	Patent Dates: Applied: May 02, 1874 Granted: Sep. 15, 1874 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Knowlton, Smith & Co.

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