CN212986595U - 一种采煤工作面工作人员数量统计装置 - Google Patents
一种采煤工作面工作人员数量统计装置 Download PDFInfo
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Denomination of utility model: A device for counting the number of workers in coal mining face Effective date of registration: 20230105 Granted publication date: 20210416 Pledgee: Guiyang Rural Commercial Bank Co.,Ltd. science and technology sub branch Pledgor: Guizhou Yuteng coal industry big data information center Co.,Ltd. Registration number: Y2023520000001 |
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Date of cancellation: 20230616 Granted publication date: 20210416 Pledgee: Guiyang Rural Commercial Bank Co.,Ltd. science and technology sub branch Pledgor: Guizhou Yuteng coal industry big data information center Co.,Ltd. Registration number: Y2023520000001 |