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9
Who invented the helicopter?
The first helicopter was built by a Russian engineer named Igor Sirkorsky.
The year was 1939.
The year was 1939.
Tags:
Source: Usborne Book of Inventors and Inventions.
Source: Usborne Book of Inventors and Inventions.
Flashcard info:
Author: CoboCards-User
Main topic: Social Science
Topic: Inventors and Inventions
School / Univ.: University of Albany
City: New York
Published: 24.03.2013