US PATENT SUBCLASS 175 / 4.54
.~ With bore condition firing control, or compensating means

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


175 /   HD   BORING OR PENETRATING THE EARTH

2  DF  BORING WITH EXPLOSION IN INACCESSIBLE HOLE {12}
4.54.~ With bore condition firing control, or compensating means

DEFINITION

Classification: 175/4.54

(under subclass 2) Subject matter directed to means provided in the apparatus to (1) start, stop or modify operation of an explosive firing means in response to a sensed condition within the hole or (2) compensate for change in a hole condition due to exploding of a charge.