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Class Information
Number: 175/295
Name: Boring or penetrating the earth > Below-ground (1) hammer, or (2) impact members > With noncutting portion forwardly of sleeve impact member having a cutting portion (e.g., reamer)
Description: Apparatus in which the hammer or impact device comprises an outer sleeve provided with cutting edges and mounted for longitudinal sliding movement on a shaft, said shaft having a portion extending forwardly of said sleeve which has a noncutting function.
Patents under this class:
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