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The MCQ: In which one of the following year, filtering gas mask was invented; "Gas Mask" App Download (Free) with answers: 1915; 1920; 1935; 1950; for online elementary school classes. Solve Inventions and Inventors Quiz Questions, download Apple eBook (Free Sample) for school certificate.
Gas Mask MCQ (PDF) Questions Answers Download
The first effective filtering gas mask was invented by an African American inventor named as
- Sir Garrett Morgan
- Sir William Shockley
- John Loudon McAdam
- Sir Samuel Morse
In which one of the following year, filtering gas mask was invented?
- 1915
- 1920
- 1935
- 1950
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