ALEXANDRIA, Va., Nov. 11 -- United States Patent no. 12,467,320, issued on Nov. 11, was assigned to Satoshi Anzai (Yokohama, Japan).
"Ground drilling device" was invented by Satoshi Anzai (Yokohama, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "Provided a ground drilling device capable of reducing the maintenance time by suppressing wear of the rotary blade, extending the life of each component, and reducing the frequency of drilling pipes. The ground drilling device includes: the rotary blade that excavates the ground; the lubricating liquid jetting device that jets the lubricating liquid to the rotary blade when excavating the ground, and the oxygen supply device that supplies oxygen to the lubricat...