ALEXANDRIA, Va., April 9 -- United States Patent no. D1,069,626, issued on April 8, was assigned to Otis Elevator Co. (Farmington, Conn.).
"Fire alarm device" was invented by Zhe Li (Hangzhou, China) and Sisi Zheng (Hangzhou, China).
The patent was filed on Sept. 21, 2021, under Application No. D/808,562.
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