Czech trademark registrations provide a handy and comprehensive history of the names and addresses of the companies involved - here following Walter through its many incarnations since 1929. It is a mystery quite why companies changed their names so often during the communist period. Or perhaps, in the absence of the need to build a brand, there is little reason not to change your name. For a period the factory was named after Jan Šverma, a Czeckoslovak communist hero who died in 1944 during an insurrection of Slovak communists against the Nazi-backed Slovak state.
This particular trademark is registered for aero engines (Walter’s main business) and makes no mention of bicycle parts.