ALEXANDRIA, Va., March 24 -- United States Patent no. D1,119,648, issued on March 24, was assigned to Otis Elevator Co. (Farmington, Conn.).
"Elevator hall call board" was invented by Zhe Li (Hangzhou, China) and Sisi Zheng (Hangzhou, China).
The patent was filed on Oct. 3, 2024, under Application No. D/966,564.
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