US PATENT SUBCLASS 52 / 721.3
.~.~.~ Sustainer

Current as of: June, 1999
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52 /   HD   STATIC STRUCTURES (E.G., BUILDINGS)

720.1  DF  SHAFT (I.E., ELONGATED RIGID STRUCTURE) {15}
721.1  DF  .~ Stone-like component (e.g., concrete, etc.) {2}
721.2  DF  .~.~ Upright {3}
721.3.~.~.~ Sustainer {1}
721.4  DF  .~.~.~.~> Having outer layer or shell {1}

DEFINITION

Classification: 52/721.3

Sustainer:

(under subclass 721.2) Structure wherein the shaft is configured to resist axial force and is intended to be used as a load-bearing unit.