Improved structure of check valve device for preventing back-flow of urinary
- 专利权人:
- HUANG; JUN-QIN
- 发明人:
- HUANG, JUN-QIN,HUANG, ZI-ZHEN
- 申请号：
- TW100217046
- 公开号：
- TWM421105U
- 申请日:
- 2011.09.09
- 申请国别(地区):
- TW
- 年份:
- 2012
- 代理人:
- 摘要：
- 来源网站：
- 中国工程科技知识中心
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