US PATENT SUBCLASS 434 / 223
.~.~ Visual signalling

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

219  DF  OCCUPATION {8}
222  DF  .~ Code communication {1}
223.~.~ Visual signalling

DEFINITION

Classification: 434/223

Visual signalling:

(under subclass 222) Subject matter relating to a system such as semaphore using signals that can be seen.