| Country of Origin | United States |
|---|
Check the listing for details. Vintage Slide Rule: Engineering Instruments inc 250-BT in sleeve, missing cursor. Condition: Used, Made in United States. Listed at 10.00 USD. The Vintage Slide Rule by Engineering Instruments inc 250-BT is a unique collectible piece originating from the United States. Though missing its cursor, this slide rule still holds historical significance as a tool used in engineering and mathematical calculations. With its intricate design and craftsmanship, this vintage slide rule is a nostalgic reminder of the precision and accuracy of bygone eras in science and medicine. Pre 1970. Vinyl case has some stains but intact and no tearing
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