US PATENT SUBCLASS 33 / 25.4
.~.~.~ Progressive lettering

Current as of: June, 1999
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33 /   HD   GEOMETRICAL INSTRUMENTS

18.1  DF  SCRIBER {10}
23.01  DF  .~ Pantographic {12}
25.1  DF  .~.~ Parallelogram type {4}
25.4.~.~.~ Progressive lettering

DEFINITION

Classification: 33/25.4

Progressive lettering:

(under subclass 25.1) Subject matter which includes structure to serially contact the tracing member with plurality of symbol patterns used in printing or writing.