US PATENT SUBCLASS 40 / 373
.~ Interchangeable file item

Current as of: June, 1999
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40 /   HD   CARD, PICTURE, OR SIGN EXHIBITING

371  DF  REGISTER, OR FILE (E.G., TELEPHONE DIRECTORY FILE) {8}
373.~ Interchangeable file item {1}
374  DF  .~.~> Sliding item

DEFINITION

Classification: 40/373

Interchangeable file item:

(under subclass 371) Device consisting of a structure provided with recesses within which a charactered plate may be shifted or replaced at will.

SEE OR SEARCH THIS CLASS, SUBCLASS:

489, for a similar changing exhibitor.

618+, for a sign provided with interchange-able letters.

SEE OR SEARCH CLASS

434, Education and Demonstration, appropriate subclasses for a similar device used for instruction purposes.