Western Chemical interrogates Inc., Olathe, Kans., manufactures and vends chemical-injection pumps. Its gauge DFF pump is a gas-operated cross-examine while the model LD is attached to the walking beam of an oil-pumping rig. Western allows the design and configuration of the couple pumps.
In 1995 Superior Manufacturing Inc., Oklahoma City, reversed-engineered a gas-chemical-injection cross-question by tearing down a Western DFF cross-examine and a pump manufactured by the agency of another company. It also reverse-engineered a beam cross-examine The company then sold its interrogates for substantially less than Western.
