US PATENT SUBCLASS 73 / 742
.~.~.~ Helical Bourdon tube

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

700  DF  FLUID PRESSURE GAUGE {20}
732  DF  .~ Bourdon {7}
741  DF  .~.~ Bourdon tube and mounting {2}
742.~.~.~ Helical Bourdon tube

DEFINITION

Classification: 73/742

Helical Bourdon tube:

(under subclass 741) Subject matter wherein the tubular pressure responsive element is in the form of a helix.