US PATENT SUBCLASS 29 / 890.04
.~.~.~ With inserted tubes

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

592  DF  METHOD OF MECHANICAL MANUFACTURE {54}
890.03  DF  .~ Heat exchanger or boiler making {15}
890.039  DF  .~.~ Sheet joined to sheet {2}
890.04.~.~.~ With inserted tubes

DEFINITION

Classification: 29/890.04

With inserted tubes:

(under subclass 890.039) Process wherein the heat exchanger device or boiler made comprises a plurality of broad generally flat members joined directly together having a plurality of elongated hollow generally cylindrical members extending therethrough.