PASSIVE NOISE CANCELLING DEVICE
- 专利权人:
- 发明人:
- 申请号：
- EP14750603.4
- 公开号：
- EP3025326B1
- 申请日:
- 2014.07.18
- 申请国别(地区):
- EP
- 年份:
- 2018
- 代理人:
- 摘要：
- A device for use by a dental patient fits in the patients ear and has at least one curved resonator tube to reduce the perceived volume of a dental drill. The device can have multiple layers of resonator tubes and a port into which recorded music can be played to calm the patient further
- 来源网站：
- 中国工程科技知识中心
