steel steel structure equipment
analog seismograph tape recorder
magnetic tape recorder
磁带录音机
磁带记录器
磁带记录仪
磁带录声机
磁带录音器
磁带纪录器
photoelectric tape recorder
seismograph tape recorder
tape recorder
磁带录音机
磁带记录仪
纸带记录仪
磁带记录器
带记录器
磁带记录器
磁带录像机
卷带纪录器
磁带纪录器
盘式录音机
录音机
磁记录
录讯机
磁带机
录像机
television tape recorder
video magnetic tape recorder
carbon steel low alloy steel
compound steel 2 25Cr-1Mo and stainless steel
compound-plate of stainless steel and carbon steel