Römerwerk were gunmakers at Suhl, established before 1910. They were taken over by F.W. Heym (August Heym) in 1938. If you do a web search for them make sure you use the “ö” (umlaut).
Here's how to type the umlaut on your keyboard. The umlaut is the double dots over the top of certain letters. To do the umlaut:
(1) Hold down the Ctrl key then press the Colon key(Shift . [So to clarify this - you will be holding down the Ctrl key, the Shift key and colon key all together at the same time.... i.e you will have 3 keys held at once.]
(2) Release all keys simultaneously.
(3) Type the appropriate letter a, e, i, o, u, y.
If this fails you can always copy and paste them.