Group 1 - The core viewpoint of the articles highlights the growth and innovation of the elevator industry in Ningjin County, Shandong Province, particularly in the installation of elevators in old residential buildings [1][2] - Bolt Elevator Company has developed a modular installation method that significantly reduces construction time to five days, minimizing disruption to residents [1] - Since entering the old building elevator installation market in 2016, Ningjin's elevator enterprises have evolved from small and scattered to a comprehensive industry covering various segments, maintaining a leading position in production and sales nationwide [1] Group 2 - Ningjin's elevator parts companies have shifted from basic production to core component research and development, capturing a significant share of the domestic market [2] - The elevator industry in Ningjin has formed a collaborative industrial cluster characterized by leading companies, coordinated adaptation, and breakthrough chains, with products exported to over 50 countries and regions [2] - In 2024, the total output value of Ningjin's elevator industry is projected to reach 6.5 billion yuan, with a profit growth of 6.75% for large-scale enterprises [2]