Hearing Aid Companies

How many hearing aid companies are there around the world? As far as I know, there are 24. I learned so much about today's hearing aids doing the research for this article. Modern hearing aids have so many "cool" features and designs. I almost wish I was a child again so I could wear one of those hearing aids. I especially would have liked to have had a waterproof one for all those times I went to an amusement park and rode the log flume.