US PATENT SUBCLASS 73 / 82
.~.~ Impact type

Current as of: June, 1999
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73 /   HD   MEASURING AND TESTING

78  DF  HARDNESS {2}
81  DF  .~ By penetrator or indentor {4}
82.~.~ Impact type

DEFINITION

Classification: 73/82

(under subclass 81) Subject matter for measurement of hardness of materials wherein a penetrator or indentor is impelled against the specimen under a predetermined force.