Greven's Adreßbuch des Rheinisch-Bergischen Kreises 1939, page GewVz-273: Claudi Viktor (null)
Greven's Adreßbuch des Rheinisch-Bergischen Kreises 1939
You can report transcription errors here. (It is only a transcription error if, for example, the source reads "Wilhelm" but "Wihlem" was transcribed. It is not a transcription error if the source reads "W." and you suspect it should be "Wilhelm".)