Oticon:

It is the leading hearing aid manufacturer in Denmark, founded in 1904 by Hans Demant, whose wife suffered from hearing loss.
This is where the story of Oticon begins.(https://www.oticon.global/about/oticon/history)

The company is currently led by William Demant Holding Group, with branches in about 100 countries, including a large production plant in Poland. In 2016, Oticon launched the first ever Internet-connected hearing aid – Oticon OPN. Thanks to the OpenSound Navigator module, for the first time it is possible to perceive and manage complex sound waves and noisy environments. This module performs a scan about 100 times more per second of the environment, providing balanced analysis and perception of each sound, and therefore convenience and in noisy places.

Rayovac:

This company is one of the largest manufacturers of alkaline batteries of various sizes ranging from AAA to 9V, rechargeable batteries, hearing aids, lithium batteries, and portable battery chargers.

This Company, originally known as the “French Battery Manufacturing Company”, was established in 1906 in Madison, Winconsin by James Bowen Ramsay (1869–52), with its first president, Alfred Landau. In 1910, marking the first year of the company’s highly successful achievements, the presidency passed to Mr. C.F. Burgess. After a powerful fire that engulfed headquarters in 1915, Burgess eventually relinquished the presidency. However, battery production continued throughout the years of World War I, and by 1920, the company had more than $ 2.74 million in annual sales and about 600 employees in total. In 1930, no. of employees reached 1,000, and the company name was changed to “Ray-O-Vac”, a name that relates to old and new technology, vacuum tubes and electron beams. In 1933, RAYOVAC won the patent for the production of first batteries for hearing aids. One of the company’s biggest achievements was especially during World War II, when the company supplied some 500 million batteries to the US military, making a significant contribution to US victories.
In the 70’s, another company under the RAY-O-Vac logo was also opened in England. While the official name “RAYOVAC” puts it in 1988.
With over 113 years of experience, Rayovac is one of the largest and most successful companies in the production of all types of batteries, including hearing aids.

Interacoustics A/S:

Interacoustics A / S: a company established since 1967 in Middelfart, Denmark, designs and manufactures audiological equipment, offering a wide range of specialized products for the measurement and testing of specific listening levels of different age groups; ophthalmic and otoscopic equipment; measuring rooms, as well as certificates and user manuals. Interacoustics A / S offers software programs, such as specialized modules for the operation, updating, and calibration of audiometric and otoscopic devices, which also enable the establishment of a database system with all patient data and relevant examinations. This company has its own distributor network throughout Europe and beyond and operates as a subcontractor of the ‘William Demant Holding A / S’ Group.

Maico:

For over 8 decades, Maico has been an innovative company in the production of audiometric devices, offering a range of products ranging from detailed hearing level screening to alternative diagnostic solutions.

Maico is a medium-sized company, founded by Leland A. Watson, in 1937 in Minneapolis, USA. It operates closely with hearing aid companies as a subcontractor of the ‘William Demant Holding A / S’ Group since 1995. Currently, Maico equipment is sold in about 112 countries around the world.

Dreve:

The Dreve Company, for over 70 years, operates in the field of medical device manufacturing related to the production of ear masses, as well as other equipment for the production of other functional parts of a hearing aid. The company also offers a wide range of products for cleaning ear masks and hearing aids, as well as separate, accessory accessories for equipment used in acoustic prosthetics laboratories.

Dreve is certified to the European standard for the production of quality products: DIN EN ISO 9001 and DIN EN ISO 13485.