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US Patent: 1,503,640
Internal Combustion Engine
Patentees: Charles E. Curtiss (exact or similar names) - Cleveland Heights, Cuyahoga County, OH Harry L. Allen (exact or similar names) - Cleveland, OH USPTO Classifications: 123/41.31, 123/41.53, 123/41.77, 123/41.81 Tool Categories: Assignees: Bruce-Macbeth Engine Co. - Cleveland, OH Manufacturer: Not known to have been produced Witnesses: none listed	Patent Dates: Applied: Dec. 21, 1921 Granted: Aug. 05, 1924 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Bruce-Macbeth Engine Co.

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