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File:US Ruler.JPG - Wikimedia Commons
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![Vintage AMERICAN PAMCOR Lenticular 6" Ruler Decimal Fraction 1950s USA | eBay](https://i.ebayimg.com/images/g/QbMAAOSwpW9iKBcO/s-l1600.jpg "Vintage AMERICAN PAMCOR Lenticular 6" Ruler Decimal Fraction 1950s USA | eBay")
Vintage AMERICAN PAMCOR Lenticular 6" Ruler Decimal Fraction 1950s USA | eBay
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CLO Standard (American) Ruler 12" Quarter Inch | CLO Design & Ed
__62165.1663277912.png?c=2 "Native American Ruler - Perch Home")
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Small Architect's Ruler Wood Plastic Edges American - Etsy
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United States National Bureau of Standards Ruler] - UNT Digital Library
