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B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
B43L7/00—Straightedges
B43L7/005—Straightedges combined with other drawing aids
FR814649D1936-12-071936-12-07Appareil à l'usage des dessinateurs pour le calcul et le tracé de toutes les lignes se rapportant aux dessins linéaires
ExpiredFR814649A
(fr)