Merchants' Graphic Profit Finder, mid 20th century
- Made:
- 1950-1970
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Merchant's Graphic Profit Finder, plastic circular slide rule giving percentage margin of profit on selling price
Merchant's Graphic Profit Finder, plastic circular ready reckoner giving percentage margin of profit on selling price, 1950-1970. Many circular ready reckoners were devised for very specific purposes in the mid 20th century.
