US PATENT SUBCLASS 166 / 364
.~ Including disaster feature

Current as of: June, 1999
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166 /   HD   WELLS

335  DF  SUBMERGED WELL {10}
364.~ Including disaster feature

DEFINITION

Classification: 166/364

Including disaster feature:

(under subclass 335) Device wherein the well structure is provided with means allowing damaging conditions to occur without total loss of the well.