US PATENT SUBCLASS 29 / 889.722
.~.~.~.~.~ Passage contains tubular insert

Current as of: June, 1999
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29 /   HD   METAL WORKING

592  DF  METHOD OF MECHANICAL MANUFACTURE {54}
889  DF  .~ Impeller making {7}
889.7  DF  .~.~ Blade making {2}
889.72  DF  .~.~.~ Hollow blade {1}
889.721  DF  .~.~.~.~ With cooling passage {1}
889.722.~.~.~.~.~ Passage contains tubular insert

DEFINITION

Classification: 29/889.722

Passage contains tubular insert:

(under subclass 889.721) Process wherein the cooling passage receives therein a hollow cylindrical member.