Same inventions by different people
The principles of differential calculus were determined by Sir Isaac Newton in England and Gottfried Wilhelm Leibniz in Germany at about the same time in 1669. In 1876, one hour before Alexander Graham Bell registered his patent for the telephone, Elisha Gray patented his design. After years of litigation, the patent went to Bell. Gray invented the first electronic musical instrument. He had accidentally discovered that he could control sound from a self-vibrating electromagnetic circuit and in doing so invented a basic single note oscillator. The Musical Telegraph used steel reeds whose oscillations were created and transmitted over a telephone line by electromagnets. At the same time, around 1874, Bell had also designed an experimental “Electric Harp” for speech transmission over a telephone line using similar technology to Gray’s. At 17 December 1903, Orville Wright took the Flyer that he and his brother Wilbur built into the air for what has come to be known as the first powered flight. Earlier, Gustave Whitehead and Richard Pearse were also experimenting with flying machines. It still remains a controversy who actually took first to the sky.