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G06G1/02—Devices in which computing is effected by adding, subtracting, or comparing lengths of parallel or concentric graduated scales
G06G1/04—Devices in which computing is effected by adding, subtracting, or comparing lengths of parallel or concentric graduated scales characterised by construction
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CH152934D1930-09-181930-09-18Dispositif pour effectuer des multiplications.
CH152934A
(fr)