permitted electric detonator for coal mine

例句：

1. 1.The mine uses a permitted electric detonator to ensure the safety of its workers.
   该矿使用允许的电引爆器来确保工人的安全。
2. 2.The mining company has invested in new technology to improve the efficiency of their permitted electric detonators.
   矿业公司投资新技术以提高其允许的电引爆器的效能。
3. 3.The permitting process for electric detonators is rigorous, ensuring only certified products are used in the mine.
   对电引爆器的许可过程严格，确保只有经过认证的产品才能在矿井中使用。