I looked at this picture several times before I saw the calculator. This was a meeting of the Rice Fund Council in May, 1973 so there are only a couple of things it could possibly be:
I think it’s a HP-35 but I’m not certain. Unfortunately I don’t recognize the gentleman who’s holding it.
Norman is at the head of the table with Malcolm Lovett, Sr. at the right, then I think Jim Teague. I’d be willing to be that the fellow with the long sideburns and glasses to the right of the guy with the calculator is Harry Chavanne. Otherwise, I’m lost.