ALEXANDRIA, Va., April 9 -- United States Patent no. D1,069,710, issued on April 8.
"Rotor blade" was invented by Lukasz Cejrowski (Wloclawek, Poland) and Kamil Ciszak (Antoninow, Poland).
The patent was filed on Dec. 29, 2023, under Application No. D/520,012.
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