晶闸管模块无触点开关
thyristor moduled contactless switches
无触点开关装置
contactless switching device
新型无触点较开关
A new contactless soft switch
新型无触点接近开关
The New Type of un-touching Approach Switch
无触点点火系统
breakerless ignition system
油压力步进开关触点
oil pressure step switch contact