Vintage Calculator - Champion Lightrule - Champion Lampworks - Lumens - Foot Candle Values - Slide Rule - Lynn, Mass - Cardboard - 1947
Original Paper Sleeve Packaging
Lumens of fixture and area per fixture
Foot candle values
Cardboard Push/Pull Card - Slide Rule
Measures: 9 1/2 by 3 1/4 inches
Condition: good condition - wear, age discoloration, spots
I combine shipping on all items purchased together and refund excess overages.
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My other Vintage Shops on Etsy:
Vickie's Vintage Books - Classics - Cook Books - Children's Books and Recordshttps://www.etsy.com/shop/VickiesVintageBooks
Vickie's Vintage Prints and Book Plates at Vickie's Beach Househttps://www.etsy.com/shop/VickiesBeachHouse