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Lecture 10 : Drilling Machines-1

Name: Lecture 10 : Drilling Machines-1 | 影片 | 乾淨世界
Uploaded: 2023-12-02T18:01:57.068Z
Duration: 25 min 25 s
Description: jackhammer, boom, jumbo drill, drill rod, drill bit, top hammer, | 影片 | 乾淨世界