ALEXANDRIA, Va., April 9 -- United States Patent no. D1,069,871, issued on April 8, was assigned to SHAJENG HARDWARE Co. LTD. (Taichung, Taiwan).
"Step drill" was invented by Jen-Tsung Liao (Taichung, Taiwan).
The patent was filed on Sept. 1, 2023, under Application No. D/911,386.
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