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
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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