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The first hearing aid was created in the 17th century. The movement toward modern hearing aids began with the creation of the telephone, and the first electric hearing aid was created in 1898. By the late 20th century, the digital hearing aid was distributed to the public commercially. Some of the first hearing aids were external hearing aids.
The Frankfurt Stock Exchange is the largest stock exchange in Germany and most major German public companies are listed on it. It is owned by Deutsche Börse which also operates Xetra . There are also many non-German companies listed on the Frankfurt Stock Exchange.
In the European region, there are multiple stock exchanges among which five are considered major (as having a market cap of over US$1 trillion): . Euronext, which is a pan-European, Dutch-domiciled and France-headquartered stock exchange composed of seven market places in Belgium, France, Ireland, the Netherlands, Italy, Norway, and Portugal.
This page lists company lists ordered by the stock exchange the companies are listed on. This list is incomplete ; you can help by adding missing items . ( August 2012 )
The Telex Corp. specimen stock certificate Telex Communications , originally Telex Corporation, was a Burnsville, Minnesota -based manufacturer of hearing aids and audio equipment. Founded in 1936 as a maker of hearing aids, it entered the computer peripherals businesses in the 1960s.
Companies listed on the Frankfurt Stock Exchange (4 C, ... Hamburg Stock Exchange; K. ... Stock exchanges in Germany.
List of European stock exchanges; Other lists. List of largest German companies; Other stock market indices. List of stock market indices; CDAX, every listed German company; HDAX, union of DAX, MDAX and TecDAX (successor to DAX 100, and equivalent of the FTSE 100 or the S&P 100) MDAX, the next 50 largest companies after the DAX; SDAX, the next ...
ADC Telecommunications was founded in 1935 in Minneapolis, Minnesota, by Ralph Allison and Walter Lehnert. [2] [3]During their first year in business, ADC built hearing aids and audiometers—a machine used for evaluating hearing acuity.