I live among an Old Order Amish Community, and my neighbor is one of the teacher. He has used this device for years, but it have broken and he would like to hold a replacement of some kind.
Of course, using a computer or calculator is not an way out, but go ahead and enjoy a giggle if you must.
Any accepted wisdom?
Answers: I'm familiar beside the handheld slide card-style aids, and I know such average finders are on the market, but I don't read what the "self-adding" part of your neighbor's card refers to. ? If you could explain it somewhat more, that might help us integer out a suitable substitute.
In the meantime, if he's looking for a replacement that's the exact brand of his discontinued old one, the one and only other thing that occur to me is to post on Craigs Lists in a range of cities. I'm sure someone out there still have one.
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