US PATENT SUBCLASS 281 / 20
.~ Protectors

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}
20.~ Protectors

DEFINITION

Classification: 281/20

Means applied in book backs, sides, and leaves for protecting the books against hard usage.

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29+, compare with this subclass (20) for book-covers.