This class provides for subject matter relating to the followingwhen not provided for elsewhere:
The control or treatment of water in open channels, naturallyor artificially occurring bodies of water, or of water otherwiselying on the earth"s surface.
The control or treatment of earth material is situ, and the securementor stabilization of structures in the earth.
Storage of fluid in underground cavities and disposal of wastein the earth.
Tunnel construction or pipe or cable laying or retrieving.
Apparatus and methods by which underwater work operationsmay be performed.
Apparatus and methods for launching a marine vessel into orremoving it from a body of water, transportation of a vessel acrossdry land, or exposing a normally wetted surface, e.g., a vessel"shull, to the atmosphere.