I couldn't find a manual for your calculator model .
It is a basic model though.
I suggest you check VICTOR TECHONOLOGY calculators page:
http://www.victortech.com/productLine.asp
Look for a calculator model that looks like yours, click on "Details" and you'll reach another page from where you can download its manual.
They are selling a refurbished 1220-3 calculator, but they don't give any link to the manual.
You might also find that other manufacturers calculators look and function like yours.
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