US PATENT SUBCLASS 175 / 4.58
.~.~ With means to initially restrain projectile for pressure build-up

Current as of: June, 1999
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175 /   HD   BORING OR PENETRATING THE EARTH

2  DF  BORING WITH EXPLOSION IN INACCESSIBLE HOLE {12}
4.57  DF  .~ Projectile forms bore {2}
4.58.~.~ With means to initially restrain projectile for pressure build-up

DEFINITION

Classification: 175/4.58

(under subclass 4.57) Subject matter directed to means which are provided to temporarily hold back the missile at the time of firing the explosive charge so as to build up pressure behind the missile and propel the missile with high initial acceleration when the holding means is overcome.