(under subclass 211) Method or apparatus wherein the structure is protected by a shell or facing constructed on or assembled to the exterior of said structure, or by a substance applied to the exterior to form a layer thereon.
SEE OR SEARCH CLASS
52, Static Structures (e.g., Buildings),
721.1+, 736.3+, and 738.1 for a shaft having a dissimilar shell or facing.
249, Static Molds,
1, for apparatus for molding a protective coating on a pile.