Retractable beehive entrance leaking feed-trough

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• 2. 防治立式水力机械轴承油槽透平油溢漏的内挡油圈 [P] . 中国专利： CN2576996Y . 2003.10.01
• 3. BEEHIVE ENTRANCE WITH POLLEN TRAP BEEHIVE ENTRANCE WITH POLLEN TRAP [P] . AU508923B3 . 1980-04-03

  机译： 花粉陷阱的蜂巢入口花粉陷阱的蜂巢入口

• 4. BEEHIVE ENTRANCE PARTITIONING APPARATUS HAVING BEEHIVE IDENTIFYING FUNCTION FOR GROWING TWO QUEEN BEES OF FIRST GROUP [P] . 韩国专利： KR20190142052A . 2019-12-26

  机译： 具有蜂鸣识别功能的蜂群入口划分装置，用于培养第一组的两只蜂

• 5. BEEHIVE DUCT OF BEEHIVE ENTRANCE ATTACHMENT [P] . UA63271U . 2011-10-10

  机译： 蜂巢入口的蜂巢管道

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