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US Patent: 454,738
Rotary Engine
Patentee:
Emil F. Holmgreen (exact or similar names) - Brooklyn, Kings County, NY

USPTO Classifications:
418/5, 418/60, 418/65

Tool Categories:
propulsion and energy : steam apparatus : rotary steam engines

Assignees:
Emil F. Holmgreen - Brooklyn, Kings County, NY
Hugh De Haven - Brooklyn, Kings County, NY

Manufacturer:
Not known to have been produced

Witnesses:
Unknown

Patent Dates:
Applied: Mar. 26, 1891
Granted: Jun. 23, 1891

Patent Pictures:
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