Inventions Practice Tests
Inventions Online Tests
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The MCQ: Variable pitch aircraft propeller was invented by; "Variable Pitch Aircraft Propeller" App Download (Free) with answers sir walter rupert turnbull, sir lillian moller gilbreth, sir nicholas jacques conte and sir john patch for virtual online school. Solve inventions and inventors quiz questions, download Google eBook (Free Sample) for virtual elementary school.
MCQ 1: The variable pitch aircraft propeller was invented by
MCQ 2: In which one of the following year, the variable pitch aircraft propeller was invented?
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