helmetn.头盔;安全帽
helmet-mounted binoculars头盔式双目望远镜
Helmet of Black Knight Chief黑骑士队长头盔
Helmet Mounted Cueing System头盔提示系统
Helmet Position Sensing System头盔位置感觉系统
helmeted radio speaker-phone盔式无线对讲机
Helmet Optical Position Sensor头盔光学位置检测器
helmet-type diving apparatus头盔式潜水装具
Helmets for motor vehicle users摩托车乘员头盔
Helmet Attitude Tracking System飞行帽式姿态跟踪系统