> They will probably need some agreement with Telefunken?
No, as I understand it "Telefunken USA" operates without any connection to the European owners of the Telefunken name (or other trademarks, such as the well-known Telefunken "diamond logo"), and the company has to be very careful not to get caught selling their products in Europe. Their Web site carries these lines at the bottom: "Telefunken | USA™, located in the state of Connecticut, USA, is in no way related or affiliated with the original Telefunken Company of Germany. / All products manufactured by Telefunken | USA™ are intended for sale in North America."
Daimler Chrysler's lawyers apparently allowed the registration of these trademarks in the U.S. to lapse, whereupon they were re-registered by a private individual over here (Oliver Archut), who then licensed their use to the Connecticut clone people.
Similarly, Klaus Heyne registered the term "ELA M" as a trademark in the U.S. so that he can license it. That was never even a trademark before, and I'm rather surprised that it can be considered one now. It was simply Telefunken's acronym "M" for microphones, or other microphone-related products such as stands or power supplies, in their listings of electroacoustical (= "Fachgebiet ELA") products. See the attached example from 1956; "V" indicates an amplifier ("Verstärker"), but I don't think anyone has trademarked "ELA V" just yet, even though there are many recreations of the V 72, for example.
The irony, of course, is that none of the "Telefunken ELA M" studio microphones were made by Telefunken--they were made by Neumann, Schoeps, AKG, Sennheiser and Beyer. Siemens and Philips among others also represented companies that were just starting up or rebuilding after the war--but no one pays sky-high prices for "vintage Siemens microphones" or "vintage Philips microphones" even when they are exactly the same as the ones Telefunken was selling.
I think this all goes to show how irrational this business is, and how easily people can be taken in, particularly in the realm of high-ticket items. It's sad, unless you're one of the people laughing all the way to the bank.
--best regards