Columbia Records introduced the first successful microgroove long-playing phonographs way back in June 1948.
早在1948年的6月，哥伦比亚唱片公司就成功引进了第一张可供留声机长时间播放的密纹唱片。
2
In plastic or hard plastic clay, or water content smaller sand application microgroove blade drill, slowly and evenly drilling.
在可塑或硬塑粘土中，或含水量较小的砂土中应用密纹叶片钻杆，缓慢地均匀地钻进。
3
In this paper, with high speed camera, the visualization experiments for the heat transfer characteristics of spray cooling on rectangle capillary microgroove groups surface were carried out.