1890, Austrian scientist Ferdinand Alte made the first generation of electronic tube hearing AIDS.
1896, the Scottish inventor Alexander Graham Bell wanted to make a better hearing aid. Bell studied some principles of converting sound into electrical signals that can be enhanced. But his research led him to invent the telephone instead of the hearing aid.
190 1 year, Miller Reese Hutchinson invented an electric hearing aid that is easy to use.
1904, Danish Hans Demandt and American Lacey hutcheson invested in mass production of hearing AIDS.
1920s, portable hearing AIDS came out, although the weight was above 1 kg.
After the invention of the transistor in the 1940s, small hearing AIDS appeared.
After the advent of microprocessors in the 1970s, almost invisible hearing AIDS were put into the ears.
At present, hearing AIDS are developing rapidly, and various forms and functions of hearing AIDS emerge one after another, so you can generally choose the hearing aid that suits you according to your hearing situation!