US PATENT SUBCLASS 52 / 220.5
.~ Completed accessible continous trench duct type

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

220.1  DF  WALL, CEILING, OR FLOOR DESIGNED FOR UTILITIES {6}
220.5.~ Completed accessible continous trench duct type

DEFINITION

Classification: 52/220.5

Completely accessible continuous trench duct type:

(under subclass 220.1) Floor containing an opening that runs the length or width thereof and is covered to provide a planar trafficable surface.