行程开关，YBLX-44/20 上海临嘉科教仪器有限公司

p1Src=//y1.yzimgs.com/uploads/391770/20250116-71329164.jpg&p2Src=//y1.yzimgs.com/uploads/391770/20250116-45561951.jpg&p3Src=//y1.yzimgs.com/uploads/391770/20250116-63038617.jpg