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Publication of FR425383ApublicationCriticalpatent/FR425383A/fr
B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
B43L13/00—Drawing instruments, or writing or drawing appliances or accessories not otherwise provided for
B43L13/02—Draughting machines or drawing devices for keeping parallelism
B43L13/04—Guides for rulers
B43L13/048—Guides for rulers with T-squares
FR425383D1911-01-301911-01-30Appareil permettant de tracer des parallèles à toutes distances données et mathématiquement à tous degrés d'obliquité
ExpiredFR425383A
(fr)