ALEXANDRIA, Va., Dec. 9 -- United States Patent no. D1,104,818, issued on Dec. 9, was assigned to Shenzhen Efercro Electronic Technology Co. Ltd. (Shenzhen, China).
"Doorbell" was invented by Chao Peng (Shenzhen, China) and Bo Xu (Shenzhen, China).
The patent was filed on April 29, 2024, under Application No. D/939,758.
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