Vintage, San Diego Gas & Electric Co. Energy Cost Calculator/ Slide Rule, 1976
$ 6.34
Description
Vintage, San Diego Gas & Electric Co. Energy Cost Calculator/ Slide Rule, 1976. Energy Cost Calculator/ Slide Rule. T his cardboard slide rule was manufactured by the Perrygraf Division of Nashua Corp. 1976. The slide rule is 3-1/2" High by 9-1/4" Wide when not extended. There is minimal wear and is in excellent working order. Vintage, San Diego Gas & Electric Co. Energy Cost Calculator/ Slide Rule. T his cardboard slide rule was manufactured by the Perrygraf Division of Nashua Corp. 1976. The slide rule is 3-1/2" High by 9-1/4" Wide when not extended. There is minimal wear and is in excellent working order. This slide rule allows you to calculate both Gas and Electric energy costs. It has an added feature to help estimate the cost of using 10 common gas appliance and 43 common electric appliances. A Useful, Interesting and Nostalgic Collectible. Multiple purchases can be combined for reduced shipping costs. Email me before purchasing for details.
