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Publication of FR890020ApublicationCriticalpatent/FR890020A/en
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
B43L13/18—Devices for drawing in perspective free-hand having optical or projecting equipment
FR890020D1942-06-261942-06-26
Apparatus allowing the exact placement on a canvas or sheet of paper of objects reproduced from nature
ExpiredFR890020A
(en)
Mode of stapling of bundles of accordion-folded sheets with interposition of sheets of copying paper for the reproduction of a text in several copies and products resulting from its application
Apparatus for stretching animal skins, fresh or semi-dry, as well as objects made of cloth, paper, etc., having a cylindrical or cylindrical-conical shape