US PATENT SUBCLASS 281 / 26
.~.~ Undercut slot
Current as of:
June, 1999
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281 /
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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.