Inventions Quizzes
Inventions Practice Test 153
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The Quiz: R-theta navigation system was invented by; "R-Theta Navigation system" App (iOS, Android) with answers: Sir Casey Baldwin; Sir Samuel Mckeen; Sir Lillian Moller Gilbreth; Sir J.E.G Wright; for elementary school graduation certificate. Study inventions and inventors questions and answers, Apple e-Book to download free sample for online degree programs.
R-theta navigation system was invented by
In which one of the following year Postal systems was established?
Mechanical television was invented by a Scottish engineer named as
In which one of the following year, gas turbine was invented?
Comets were discovered by
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