.~ Of tunneling apparatus having a wall temporary support
DEFINITION
Classification: 299/1.3
Of tunneling apparatus having a wall temporary support:
(under subclass 1.05) Process or apparatus where a subterranean corridor is formed by an earth penetrating machine with a wall engaging means, where the machine is adjusted to follow a predetermined path.
SEE OR SEARCH CLASS
405, Hydraulic and Earth Engineering,
141+, for boring a tunnel with the cutting device including a shield.