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Class Information
Number: 175/290
Name: Boring or penetrating the earth > Cutter element laterally shiftable below ground (e.g., expansible) > With latch
Description: Apparatus combined with a movable member which engages the laterally movable cutter element to hold it in one position.

Patents under this class:

Patent Number Title Of Patent Date Issued
7730974 Self actuating underreamer Jun. 8, 2010
7370712 Under reamer May. 13, 2008
6929076 Bore hole underreamer having extendible cutting arms Aug. 16, 2005
4091883 Underreaming tool with overriding extended arm retainer May. 30, 1978

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