Hans Having recently become a distributor of the GB4000, I, plus any other distributors, most as far as I know, also forum members (but scarce) surely know who the manufacturer is. It took me MANY months to find out, as those I approached initially, claimed to be 'the' manufacturer (maybe worded slightly differently though) themselves!
This isn't important to know though, as long as your supplier gives you the service he/she promised you. Manufacturers don't want to be bothered with clients' zillion questions ... that's why they pay others to perform this essential service on their behalf.

@nnie
PS: Please don't ask me though, 'cause I'm not telling.