What was Edison's first patent?

Edison was a famous American scientist. In his long career of invention, he successively invented the electric light? Movies? Thousands of new products suitable for people's needs, such as phonographs? * * A total of 1 180 patents were obtained in his life, so he was known as the "king of inventions"?

At the age of 2 1, Edison worked as a telegraph operator in Boston company? When he copied the news telegram, he found that every resolution passed by parliament was always sung? Integral? Check again and again and let the good times pass? Feel sorry? So, he used his spare time to study repeatedly? At the end of the experiment, a voting recorder was invented?

1In the winter of 867, Edison submitted a patent application to the US Patent Office? One day in the middle of the following year 10, 10, he anxiously opened the reply from the patent office? The letter said that his patent application passed the examination and was allowed to register. The registration number is 90646 and the registration dates are 1868, 10, 1 1. This is Edison's first patent?

Edison was very surprised when his first patent was approved, so he immediately raised enough money to go to Washington to publicize his patent?