Description: C H Webb THE ADDERMechanical Adding Calculator 1890s The Webb Adder is one of the first highly successful adders or mechanical calculators. It was invented by Charles Henry Webb, a poet, writer, friend of Mark Twain and Bret Harte. The first model of the adder was patented in1868, with improvements patented in 1889. This model is made sometime after 1890 - the patent date has been dropped. On the back, the number 862 has been stamped. Works well, resets easily.
Price: 290 USD
Location: Hayward, California
End Time: 2024-11-25T14:37:20.000Z
Shipping Cost: 13 USD
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All returns accepted: ReturnsNotAccepted
Maker: C. H. Webb
