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Class Information
Number: 175/3
Name: Boring or penetrating the earth > Boring with explosion in inaccessible hole > Severing formed core by explosion
Description: Process or apparatus involving a step or means utilizing an explosive charge to separate a previously formed undisturbed core from the formation.

Patents under this class:

Patent Number Title Of Patent Date Issued
5756926 EFI detonator initiation system and method May. 26, 1998

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