B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
B65D27/00—Envelopes or like essentially-rectangular flexible containers for postal or other purposes having no structural provision for thickness of contents
B65D27/32—Opening devices incorporated during envelope manufacture
B65D27/34—Lines of weakness
Landscapes
Engineering & Computer Science
(AREA)
Mechanical Engineering
(AREA)
Financial Or Insurance-Related Operations Such As Payment And Settlement
(AREA)
Diaphragms For Electromechanical Transducers
(AREA)
Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation
(AREA)