US PATENT SUBCLASS 40 / 489
.~ Interchangeable plate


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

446  DF  CHANGING EXHIBITOR {25}
489.~ Interchangeable plate {1}
490  DF  .~.~> Sliding


DEFINITION

Classification: 40/489

Interchangeable plate:

(under subclass 446) Device comprising interchangeable letters, consisting of a frame provided with recesses within which charactered plates may be shifted or changed at will.

SEE OR SEARCH THIS CLASS, SUBCLASS:

618+, for signs provided with interchangeable letters.

SEE OR SEARCH CLASS

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