Zapp denied being the inventor of a SPY camera, but could not get rid of this designation which he felt insulting.
I've heard that. My Dad was quite an authority on Minox, and owned and used several. He also had several publicaions about Zapp and Minox. I now have them along with one I had previously, and value them all.
Moma don't take my Kodachrome away!
Oops, Kodak, of all people, did!