US PATENT SUBCLASS 404 / 24
.~.~ Concrete frame

Current as of: June, 1999
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404 /   HD   ROAD STRUCTURE, PROCESS, OR APPARATUS

17  DF  PAVEMENT {9}
22  DF  .~ Including light admitting means {2}
24.~.~ Concrete frame

DEFINITION

Classification: 404/24

(under subclass 22) Light admitting structure wherein the housing or support for the light admitting means is Portland cement concrete.

(1) Note. The term "frame" is here intended to signify more than a mere lens, glass setting or seal made of cement.