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G06G1/02—Devices in which computing is effected by adding, subtracting, or comparing lengths of parallel or concentric graduated scales
G06G1/10—Devices in which computing is effected by adding, subtracting, or comparing lengths of parallel or concentric graduated scales characterised by the graduation
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FR4022D1903-12-071904-11-29Perfectionnements aux règles à calcul
ExpiredFR4022E
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