1. Who invented Safety razor ?

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

2. Who invented Transformer ?

Answer:

Ottó Bláthy

3. Who invented Atomic theory ?

Answer: Dalton of Britain in 1803.

4. Who invented Automatic rifle ?

Answer: John Browning of U.S.A. in 1918.

5. Who invented Air Conditioning ?

Answer:

Willis Carrier in 1902

6. Who invented Atomic numbers ?

Answer: Moseley of Britain in 1913

7. Who invented Stainless Steel ?

Answer: Harry Brearley of Britain in 1913.