US PATENT SUBCLASS 29 / 243.517
.~.~ Annular work

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

700  DF  MEANS TO ASSEMBLE OR DISASSEMBLE {55}
243.5  DF  .~ Overedge assembling means {5}
243.517.~.~ Annular work {2}
243.518  DF  .~.~.~> With radially acting tool inside annular work
243.519  DF  .~.~.~> With second workpiece inside annular work one workpiece moved to shape the other {2}

DEFINITION

Classification: 29/243.517

Annular work:

(under subclass 243.5) Apparatus wherein the first element is marginally defined by a outer circular border and by an inner circular border, concentric with the outer border.

(1) Note. The "first element" of this subclass may be very short in the dimension of the axis of the borders in the case of a ring or may be longer so that the element is a tube.

SEE OR SEARCH THIS CLASS, SUBCLASS:

726+, for apparatus used to make a heat exchanger, e.g., to secure a boiler tube to a plate.