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Swift Adder

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SwiftTopSwift Adding Machine


Patent number:2,368,311. Click here to learn more.

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SwiftBottomBottom; Text says "Business Machines Corp. Great Barrington, Mass. 933360 Made in U.S.A. Patented"




SwiftBottomMore Swift Adders; Source: Ebay




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Also check out the Sunstrand Adding Machine.
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