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US Patent: 1,539,978
Chronograph
Patentee: Guysbert B. Vroom (exact or similar names) - Washington, DC USPTO Classifications: 346/4, 346/49, 73/114.18 Tool Categories: propulsion and energy : steam apparatus : steam engine indicators Assignees: None Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Jun. 06, 1924 Granted: Jun. 02, 1925 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens The Story of the Steam Engine Indicator

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