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US Patent: 1,492,754
Engine Indicator
Patentee: John H. Sheats (exact or similar names) - Dayton, Montgomery County, OH USPTO Classifications: 346/4, 73/114.18 Tool Categories: propulsion and energy : internal combustion engines : internal combustion engine indicators industrial tools : pressure indicators Assignees: General Motors Research Corp. - Dayton, Montgomery County, OH Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Mar. 15, 1921 Granted: May 06, 1924 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens

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