Discounted Cash Flow Slide Rule

Discounted cash flow is an accountants technique for calculating the discounted present value of returns from a prospective investment.

The  rule is 310mm x 76mm and is marked as copyright by the Standard Oil Company of Chicago, Illinois in 1962.  I don’t know if it was only issued to their employees or sold to more widely.  The rule is in mint condition and thought to be rare.

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