1. Who invented Gramophone ?

Answer:

Emile Berliner in 1887.

2. Who invented Vitamin A ?

Answer: Mc Collum and M.Davis of U.S.A. in 1913

3. Who invented Safety razor ?

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

4. Who invented Microphone ?

Answer:

Emile Berliner invented the first microphone in 1876.

5. Who invented Piano ?

Answer:

Bartolomeo Cristofori

6. Who invented Bakelite ?

Answer: Leo H. Baekeland of Belgium in 1907.

7. Who invented Transformer ?

Answer:

Ottó Bláthy