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Class Information
Number: 175/25
Name: Boring or penetrating the earth > Automatic control > Of fluid pressure below ground
Description: Subject matter in which a sensed condition of operation controls a power operated means to adjust or regulate the pressure of fluid which is (1) within a borehole or (2) confined in apparatus in which the fluid pressure may be automatically adjusted or modified while the confining apparatus is within a borehole.
Patents under this class:
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