Group 1 - The State Intellectual Property Office of China granted a patent for "handwritten digit recognition method, device, electronic equipment, and computer storage medium" to China Mobile (Shanghai) Information Communication Technology Co., Ltd., China Mobile Intelligent Transportation Network Technology Co., Ltd., and China Mobile Communications Group Co., Ltd. The patent was applied for on October 2020 [1] - China Mobile (Shanghai) Information Communication Technology Co., Ltd. was established in 2018 with a registered capital of 2 billion RMB. The company has participated in 1,923 bidding projects and holds 827 patents [1] - China Mobile Intelligent Transportation Network Technology Co., Ltd. was founded in 2015 with a registered capital of 1 billion RMB. The company has engaged in 675 bidding projects and possesses 740 patents [1] Group 2 - China Mobile Communications Group Co., Ltd. was established in 1999 with a registered capital of 30 billion RMB. The company has invested in 52 enterprises and participated in 5,000 bidding projects, holding 5,000 patents [2]