US PATENT SUBCLASS 434 / 390
.~ Mining

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}
390.~ Mining

DEFINITION

Classification: 434/390

Mining:

(under subclass 365) Subject matter relating to a mining operation including subsurface mining means such as a tunnel or ventilator shaft.