Group 1 - Jiangsu Hengli Hydraulic Co., Ltd. has applied for a patent titled "Oil Cylinder and Its Working Method and Oil Cylinder Piston Rod Displacement Detection Device," with publication number CN 120557231 A, and the application date is June 2025 [1] - The patent pertains to the field of fluid pressure actuators, specifically involving an oil cylinder that includes a cylinder body with a piston rod inserted, a resistance mechanism, a direct current power supply, and a voltage measurement mechanism [1] - The voltage measurement units are directly connected to conductive components on the linear resistor, allowing for the collection of voltage data to calculate the extension length of the piston rod while avoiding interference from magnetic fields [1] Group 2 - Jiangsu Hengli Hydraulic Co., Ltd. was established in 2005 and is located in Changzhou, primarily engaged in general equipment manufacturing [2] - The company has a registered capital of 1,340.82 million RMB and has made investments in 9 enterprises, participated in 344 bidding projects, and holds 97 trademark records and 677 patent records [2] - Additionally, the company possesses 33 administrative licenses [2]