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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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FR1010766D1948-10-211948-10-21Perfectionnements aux règles à calculs
ExpiredFR1010766A
(fr)