Forum des Musikinstrumenten-Museums Markneukirchen

Dear Moderators, Members, I have a double bass with Markneukirchen-paper inside: "Gebr. Heberlein Streichinstrumenten-fabrikation Markneukirchen" Have Somebody any information about the application of this paper? Which member of Heberlein dinasty used this, when, who can be the maker, etc. The bass ...