1. Who invented Diesel Engine ?

Answer: Rudoff Diesel of Germany in 1895

2. Who invented Safety Pin ?

Answer: Walter Hunt of U.S.A. in 1849

3. Who invented Transformer ?

Answer:

Ottó Bláthy

4. Who invented Automatic rifle ?

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

5. Who invented Stainless Steel ?

Answer: Harry Brearley of Britain in 1913.

6. Who invented Air Conditioning ?

Answer:

Willis Carrier in 1902

7. Who invented Printing Press ?

Answer:

Johannes Gutenberg