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Early manual adding device

Early manual adding device
Product Description
This is an early manual adding machine. It adds and subtracts. It was used in my classes when I taught about early computing devices.
This is the only one that I have of this model.
Price includes s/h.
Total Pages
N/A
Answer Key
N/A
Teaching Duration
N/A
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$22.00
Digital Download
$22.00
Digital Download
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