CACULS- GENAILLES - LUCAS]
Les réglettes multisectrices appareil à calculs exacts et instantanés by Henri Genailles and Edouard LUCAS, Librairie Classique Eugène BELIN, Paris, 1885
Box used to calculate financial interests. Worn covers LES REGLETTES FINANCIERES by Henri Genailles, perfected by Edouard LUCAS, Librairie Classique Eugène BELIN, 1885, 11,5 x 18 x 1,2 cm
Multiplier rulers by Henri Genaille perfected by E. LUCAS, Librairie Classique Eugène BELIN, 1885 boxes
The Neperian rulers, calculating toys by Henri. GENAILLES perfected by E. Lucas E. BELIN ( box 11,4 x 12 cm )
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