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Class Information
Number: 175/303
Name: Boring or penetrating the earth > Below-ground (1) hammer, or (2) impact members > With releasable means to detachably retain telescoping members against axial reciprocation > Condition for release adjustable > Adjustable below ground
Description: Apparatus in which the adjustment may be effected while the device is in position to perform its intended function within the bore.

Patents under this class:

Patent Number Title Of Patent Date Issued
7281575 Field adjustable impact jar Oct. 16, 2007
7111678 Field adjustable impact jar Sep. 26, 2006
6988551 Jar with adjustable trigger load Jan. 24, 2006
4919219 Remotely adjustable fishing jar Apr. 24, 1990

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