Wilka is another (German) lock manufacturer -
www.wilka.de
I believe they were the first people to use their brand name for the keyway (the keyway looked like "WILKA"),
a concept now used e.g. by CES to legally protect the key blanks through brand law - other than patents, brand rights can be extended forever...
(not 100% sure though if it was really Wilka and if they were first).
Cheers,
mh
