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Publication of FR546788ApublicationCriticalpatent/FR546788A/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
FR546788D1921-02-041922-02-04Dispositif servant à tracer des traits parallèles, au moyen d'un té, à tout endroit voulu de la planche à dessin
ExpiredFR546788A
(fr)