Which inventor is known for the development of acetylene gas and gas welding in 1902?

The inventor recognized for the development of acetylene gas and the method of gas welding in 1902 is Gustaf Dahlen. His contributions to this field were significant because acetylene gas, when mixed with oxygen, produces a high-temperature flame suitable for welding metals. This innovation paved the way for advancements in welding technology, making it safer and more efficient. Dahlen’s work also extended beyond acetylene; he is known for creating the gas mantle for lamps, which enhanced illumination capabilities.

The other individuals listed made notable contributions in different areas: Thomas Edison is primarily known for his inventions related to electricity and the phonograph; Alexander Graham Bell is famous for inventing the telephone; and Henri Fayol is recognized for his contributions to management theory and practices. Their work does not pertain to gas welding or the use of acetylene gas. Thus, Dahlen stands out as the correct answer in the context of gas welding technology.