OIL GAS FIELD DOWN HOLE

Brand	Owner	Address	Description
AMEGA WEST	CRS HOLDINGS INC.	15th Floor 1735 Market Street Philadelphia PA 19103	Oil and gas field down-hole equipment tooling, namely, stabilizers, drill collars, subs, hole openers and bottom-hole assembly tools;Repair and maintenance of down-hole equipment tooling and assemblies used in the drilling of oil and gas wells; leasing and rental of oil well drilling and production tools, namely, drill collars, stabilizers, subs, hole openers, float valves, baffle plates, sleeves, and drillpipe screens;
	Where the owner name is not linked, that owner no longer owns the brand

Technical Examples

A magnetic polishing method capable of easily and satisfactorily polishing the inner peripheral end face of a circular hole (1) at the center part of a disk substrate (2) even if the diameter of the circular hole is reduced. By this method, a large quantity of disk substrates with stable quality can be supplied, thermal asperity trouble and head crush can be prevented from occurring on a magnetic disk, and the density of the information recording surface of the magnetic disk can be increased. In the method for polishing the inner peripheral end face of the circular hole (1) at the center part of the disk substrate (2), a magnetic field is formed on the inner peripheral side of the circular hole (1), abrasive materials (4) including magnetic particles and abrasive grains are held by the magnetic field in the circular hole, and the magnetic field is moved to the inner peripheral end face of the circular hole (1) to move the abrasive materials (4) to the inner peripheral end face of the circular hole (1) for polishing the inner peripheral end face of the circular hole (1).