ALEXANDRIA, Va., April 7 -- United States Patent no. D1,121,788, issued on April 7, was assigned to DynaEnergetics Europe GmbH (Troisdorf, Germany).
"Alignment sub" was invented by Eric Mulhern (Edmonton, Canada) and Christian Eitschberger (Munich).
The patent was filed on May 19, 2021, under Application No. D/784,384.
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