Road signs and signalling installations apparatus and instruments of all kinds in this class; beacons in this class; mechanical signs; signalling apparatus and instruments; signals in this class; distance measuring and/or recording apparatus; luminous signals in this class; flashing lights in this class; gradient indicators; indicators of all kinds in this class; intercommunication apparatus; lenses and lens hoods of all kinds in this class; light conducting apparatus in this class; measuring apparatus; electric measuring devices; meters; monitoring apparatus in this class; neon signs; observation instruments; parking meters; range finders; relays; sound alarms; speed checking apparatus in this class; speed measuring apparatus in this class; vehicle breakdown warning signs in this class; such parts of and accessories for all the foregoing as are included in this class