US PATENT SUBCLASS 405 / 20
.~.~.~ Hinged concrete sections

Current as of: June, 1999
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405 /   HD   HYDRAULIC AND EARTH ENGINEERING

15  DF  BANK, SHORE, OR BED PROTECTION {2}
16  DF  .~ Revetment {3}
19  DF  .~.~ Mattress {1}
20.~.~.~ Hinged concrete sections

DEFINITION

Classification: 405/20

Hinged concrete sections:

(under subclass 19) Apparatus wherein the mattress is a plurality of cement or asphalt concrete segments which are flexible interconnected.