Speaking tubes
- 条目编号
- 009-4834
- 所属类别
- 第9类 科学仪器软件
- 状态
- 有效（A）
- 类型
- 商品
- 生效日期
- 12/24/2015
- 尼斯版本
- 10-2015
- TM5 通用条目
- 是
官方备注
Speaking tubes are simple devices for talking over long distances, essentially tubes with funnels at either end.
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