National Museum of American History

This brass rolling ruler is engraved with measurements on all four sides. There are rollers on either side of the ruler, connected by an axle. The object is well worn with a dent on one corner, and it is screwed together.

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Smithsonian National Museum of African American History and

Smithsonian National Museum of African American History and

Smithsonian National Museum of African American History and

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National Museum of African American history and culture

Flag Hall Smithsonian's National Museum of American History

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