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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:
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The Story of the Steam Engine Indicator

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