US PATENT SUBCLASS 434 / 389
.~ Mechanical power source (e.g., engine, windmill, etc.)

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}
389.~ Mechanical power source (e.g., engine, windmill, etc.)

DEFINITION

Classification: 434/389

Mechanical power source (e.g.., engine, windmill, etc.):

(under subclass 365) Subject matter relating to the structure or operation of mechanical means for producing or harnessing power.