US PATENT SUBCLASS 405 / 143
.~.~.~ Direction control
Current as of:
June, 1999
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405 /
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HYDRAULIC AND EARTH ENGINEERING
132
DF
UNDERGROUND PASSAGEWAY, E.G., TUNNEL
{6}
138
DF
.~ Boring {4}
141
DF
.~.~ Shield {6}
143
.~.~.~ Direction control
DEFINITION
Classification: 405/143
Direction control:
(under subclass 141) Method or apparatus wherein the course or rotation of the shield is regulated.
