US PATENT SUBCLASS 73 / 840
.~.~.~ Hydraulic or pneumatic actuation

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

760  DF  SPECIMEN STRESS OR STRAIN, OR TESTING BY STRESS OR STRAIN APPLICATION {12}
788  DF  .~ By loading of specimen (e.g., strength of material test) {16}
838  DF  .~.~ Rupture or burst strength of sheet material by transverse loading {2}
840.~.~.~ Hydraulic or pneumatic actuation

DEFINITION

Classification: 73/840

Hydraulic or pneumatic actuation:

(under subclass 838) Subject matter wherein the loading is effected by a fluid operated device.

SEE OR SEARCH THIS CLASS, SUBCLASS:

807, for devices in which fluid is applied directly to the specimen with a predetermined pressure variation.