US PATENT SUBCLASS 281 / 40
.~.~ Flat opening

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}
38  DF  .~ Leaves {3}
40.~.~ Flat opening {1}
41  DF  .~.~.~> Single leaf

DEFINITION

Classification: 281/40

Leaves modified or mounted so as to render the books in which they are bound flat-opening.