Class Information
Number: 175/271
Name: Boring or penetrating the earth > Cutter element laterally shiftable below ground (e.g., expansible) > With latch operated by fluid pressure or dropped element
Description: Apparatus in which the laterally movable cutter element is held in one position, either expanded or collapsed, by a movable latch member, said latch member being moved by (1) a fluid under pressure acting against the latch or a part connected thereto or (2) engaging a part which is specifically described as being dropped from above ground to an operative position below ground.
Patents under this class:
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