Yes! I had problems convincing some people that it was Mohr, because I had been so long familiar his voice and recognizing his eyes behind the mask.

I was lucky enough to get Kay Linaker's address and sent her a note which she kindly answered. She specifically mentioned him in the seance scene. Rush has her note here in his section for the actors under Mohr's name.

That's one great thing about Rush's site here: He is inclusive and gives credit where credit is due, all in the spirit of sharing what we know about one of the world's finest detective, Charlie Chan.