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Improvement in Rotary Engines.
Patent for improvements in valves used in rotary engines.
Date:
May 9, 1871
Creator:
Hughes, Robert
Object Type:
Patent
System:
The Portal to Texas History
Welcome to Daingerfield State Park
Pamphlet providing information on Daingerfield State Park including descriptions of facilities, fees, and equipment rentals.
Date:
May 2011
Creator:
Texas. Parks and Wildlife Department.
Object Type:
Pamphlet
System:
The Portal to Texas History