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Chenevier's memento |
There is no mention of this device in any source I have access to; but I did uncover a reference to the enterprising Monsieur Chenevier. He was, it turns out, Paul-Nicolas Chenevier (1848-1923), an architect born in Paris and active in Verdun and its vicinity. |
Exhibit provenance: I found this, marked noncommittally as an "old French calculator", in an antique mall in California.
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