US PATENT SUBCLASS 281 / 26
.~.~ Undercut slot


Current as of: June, 1999
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281 /   HD   BOOKS, STRIPS, AND LEAVES

15.1  DF  BOOK, ELEMENT THEREOF, OR ACCESSORY THEREFOR {9}
21.1  DF  .~ Binding {8}
26.~.~ Undercut slot


DEFINITION

Classification: 281/26

The backs of the signatures and leaves being slotted, the planes of the cuts being inclined to the plane of the backs.