White rubber plug with hole Tapered round plug sealing test tube Soft rubber plug Conical bottle Flask plug drilling single hole double hole Primary and junior high school chemistry and biology laboratory teaching instruments and equipment

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Tools

Color classification:: 20*200 Test control oxygen simple configuration 25*200 test control oxygen simple configuration Gas making device safety funnel type with 150ml conical bottle gas making device Safety funnel type with 2

Production enterprises:: Taizhou Tongzhuangyuan Science and Education Instrument Co, Ltd

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