আলেকজান্ডার গ্রাহাম বেল কত সালে টেলিফোন আবিষ্কার করেন ?
Alexander Graham Bell ('Graham' pronounced ) (March 3, 1847 – August 2, 1922) was a Scottish-born scientist, inventor, engineer, and innovator who is credited with inventing and patenting the first practical telephone. He also founded the American Telephone and Telegraph Company (AT&T) in 1885.
1885.