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Publication of JPS5270500UpublicationCriticalpatent/JPS5270500U/ja
Application grantedgrantedCritical
Publication of JPS5523917Y2publicationCriticalpatent/JPS5523917Y2/ja
B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
B43M—BUREAU ACCESSORIES NOT OTHERWISE PROVIDED FOR
B43M7/00—Devices for opening envelopes
B43M7/002—Hand tools
Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS