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US Patent: 137,079
Improvement in car-brakes
Patentee: John L. Knowlton (exact or similar names) - Sharon Hill, PA USPTO Classifications: 188/144 Tool Categories: transportation : railroads : railroad cars and carriages : railroad car brakes Assignees: John L. Knowlton - Sharon Hill, PA William E. Walton - Sharon Hill, PA Manufacturer: Not known to have been produced Witnesses: C. A. Merriam George Baker, Jr.	Patent Dates: Granted: Mar. 25, 1873 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin

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