1. Who invented Safety razor ?

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

2. Who invented CT scan ?

Answer: Hounsfield by Britain in 1973.

3. Who invented Bakelite ?

Answer: Leo H. Baekeland of Belgium in 1907.

4. Who invented Submarine ?

Answer:

John Philip Holland

5. Who invented Logarithms ?

Answer:

John Napier (Scotland) invented Logarithm

6. Who invented Laptop ?

Answer:

Adam Osborne in 1981.

7. Who invented Diesel Engine ?

Answer: Rudoff Diesel of Germany in 1895