.~ Keeper cooperating with retainer of varying cross-section {2}
62
.~.~ Apertured retainer
DEFINITION
Classification: 402/62
(under subclass 61) Device wherein the variation in cross-section is in the form of an opening which (1) has a continuous periphery (2) extends through the sheet retainer and (3) is disposed at an angle to the longitudinal axis of the sheet retainers.