An update on my earlier posting.
I contacted Richard Hatch by e-mail and he sent me a reply advising that the effect performed by Mike Rogers was Richard Osterlind's 'Radar Deck' which unlike 'Mind Power Deck' uses playing cards with regular faces.
From Richard's e-mail:
"While Rich (Osterlind) was playing with the
concept and showed it to me, I gave him an idea that eliminated the overt fishing (use more than one spectator simultaneously). Rich contributed the effect (later marketed) to the LINKING RING using both our names, which I hadn't expected. A different name was used. This would have been around 1985."
Richard then writes:
"I have heard many trade show workers say it
is among the strongest things they do."
I'd have to agree with this statement after having watched Mike Rogers perform this effect.
At the time I was working as a duty manager at an apartment hotel close to the convention venue where Mike was performing. A number of the guests staying at the hotel were attending that particular trade show. Chatting with two hotel guests that had seen Mike perform earlier that day, I asked them which effect had most impressed them. Both concurred that Mike's 'mind reading' with playing cards had blown them away.