Article Detail Who invented Helicopter ? Answer: Igor Sikorsky Ad Similar Questions : 1. Who invented Automatic rifle ? Answer: John Browning of U.S.A. in 1918. 2. Who invented Ball-Point Pen ? Answer: John J. Loud of U.S.A. in 1888 3. Who invented Diesel Engine ? Answer: Rudoff Diesel of Germany in 1895 4. Who invented Optical Fibre ? Answer: Indian-born American physicist Narinder Kapany 5. Who invented watch ? Answer: Peter Henlein invented the first portable time piece in 1504 6. Who invented Vitamin B1 ? Answer: Casimir Funk discovered in 1912 7. Who invented X-ray ? Answer: W.K. Roentgen of Germany in 1895. Read more from - Important Inventions