US PATENT SUBCLASS 434 / 427
.~ Apertured mask placed over information bearing surface

Current as of: June, 1999
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434 /   HD   EDUCATION AND DEMONSTRATION

365  DF  MEANS FOR DEMONSTRATING APPARATUS, PRODUCT, OR SURFACE CONFIGURATION, OR FOR DISPLAYING EDUCATION MATERIAL OR STUDENT'S WORK {37}
427.~ Apertured mask placed over information bearing surface

DEFINITION

Classification: 434/427

Apertured mask placed over information bearing surface:

(under subclass 365) Subject matter including an opaque screen having a hole or holes therein so that it can be laid on a sheet or board having information thereon to thereby reveal certain data and cover irrelevant data.