Well, here's a starting point. I've been using this list for the last couple of years as a starting point for finding manufacturers.
New project for recording.org requires:
1.) a very detailed list of all pro audio manufacturers links from around the world.
2.) If such a list exists, products that companies made over decades to current.
If we could actually find a product inventory list that linked every product made by each company, that would be amazing.
Sharing the hybrid experience
I have one, I have one, its old but its got hundreds of manufacturers on it. Can't find it at the moment though will take a proper look this evening. Drop me a PM if you need any help with this.