1. Who invented Steam Engine ?

Answer: Thomas Savery of Britain in 1698

2. Who invented Refrigerator ?

Answer:

Oliver Evans in 1805

3. Who invented Air Conditioning ?

Answer:

Willis Carrier in 1902

4. Who invented Gramophone ?

Answer:

Emile Berliner in 1887.

5. Who invented Helicopter ?

Answer:

Igor Sikorsky

6. Who invented Safety razor ?

Answer: King Camp Gillette of U.S.A. in 1903

7. Who invented Microphone ?

Answer:

Emile Berliner invented the first microphone in 1876.