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Publication of FR431257ApublicationCriticalpatent/FR431257A/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
B43L13/14—Devices for drawing in perspective
B43L13/16—Devices for drawing in perspective free-hand
FR431257A1911-06-211911-06-17Dispositif pour reproduire, agrandir ou réduire pratiquement les photographies, les dessins et leur équivalent
ExpiredFR431257A
(fr)