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 > Patents

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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