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The history function works as follows. When you are working with this calculator, every operand entered gets a line number. To edit any operand in the history the "Lin"-key followed by the line number to be edited and the "Ent"-key, enter a new operand and press the "Ent"-key again to change it. The up and down arrow keys can be used to scroll through the history, to review any past calculations and their results. The history is retained when the calculator is switched off.
This calculator can do normal percentages and also delta percentages (using the "Δ%"-key).
Many thanks to Marco de Gast for donating this calculator to the museum!