flat spring meaning in English

板簧
板片弹簧
扁弹簧
扁簧
平板弹簧

Reusable rubber contraceptive diaphragms - determination of compression resistance of coil spring and flat spring diaphragms
可重复使用的橡胶避孕工具.第7部分:卷簧和板簧避孕工具耐压缩性测定
Reusable rubber contraceptive diaphragms - determination of twisting during compression of coil spring and flat spring diaphragms
可重复使用的橡胶避孕工具.第8部分:卷簧和板簧避孕工具压缩时的扭转测定