MACHINE OPENABLE ENVELOPE
作者： Smith William W
DOI:
关键词: Front (oceanography) 、 Tear resistance 、 Envelope (motion) 、 Structural engineering 、 Acoustics 、 Edge (geometry) 、 Engineering
摘要: An envelope having front and back panels defining a cavity therebetween with lines of weak tear strength extending longitudinally across each panel from one side edge to the other overlapping so that when lower strip portion is removed, any contents within will be exposed sufficiently for gripping along thereof which projected into cavity, restricting means prevent intruding between in an area about gripped severing envelope.
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