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I have a APF Mark 40, which I found in the desk drawer at my grandmother's house. Happily the battery had been removed, to my surprise when I connected a new battery, it showed a 0. It worked except the 3, 6, and 9 keys: I disassembled the keyboard unit and found/bridged an open copper trace. Now 100% functional, I think I'll use it another 40 years.