Group 1 - The State Intellectual Property Office of China has granted a patent for a "semi-circular plate cutting device" to Sinopec Petroleum Engineering Technology Service Co., Ltd. and Sinopec Shengli Oilfield Engineering Co., Ltd. The patent number is CN223160502U, with an application date of August 2024 [1] - The patent describes a semi-circular plate cutting device that includes a cylinder, supporting mechanism, and cutter. The supporting mechanism consists of a vertical support plate and at least two horizontal supporting beams that stabilize the semi-circular plate during cutting [1] - The design allows the cutter to slide along the surface of the cylinder, ensuring stable movement and efficient cutting of the semi-circular plate, highlighting the device's simple structure and ease of use [1] Group 2 - Sinopec Petroleum Engineering Technology Service Co., Ltd. was established in 1994 and is based in Beijing, primarily engaged in civil engineering construction. The registered capital is approximately 1.898 billion RMB [2] - The company has made investments in 14 enterprises and participated in 126 bidding projects, holding 1 trademark and 1,904 patents, along with 2 administrative licenses [2] - Sinopec Shengli Oilfield Engineering Co., Ltd. was founded in 2001 and is located in Dongying City, focusing on building decoration and other construction activities. The registered capital is approximately 20.471 million RMB [2] - This company has invested in 9 enterprises, participated in 5,000 bidding projects, holds 6 trademarks, 250 patents, and possesses 162 administrative licenses [2]