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Helicopters.

 Subject
Subject Source: Library Of Congress Subject Headings

Found in 1 Collection or Record:

Albert Hoiland Papers

 Collection
Identifier: Mss 444
Abstract Mr. Hoiland was a North Dakota inventor. The collection contains various United States and foreign patents and promotional material for some of his inventions including wild oats separator (most extensive), valves, lignite grate, freight car door, flying machine (helicopter), cow trainer, car guide, and fan for explosive engines.
Dates: 1899-1953.