US PATENT SUBCLASS 405 / 19
.~.~ Mattress

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.~.~ Mattress {1}
20  DF  .~.~.~> Hinged concrete sections

DEFINITION

Classification: 405/19

Mattress:

(under subclass 16) Apparatus wherein the revetment includes a pliant member which allows the revetment, when laid, to conform to the surface being protected.