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Gears clock mechanism hand spinning gear. Loosening tightening the valve. Clock Mechanism large close. Hand-printing machine. Old printing press engravings press newspaper.

视  频 ID：  8694142
版      权：  Andrii Shramko
视频长度：  0:55
横纵比率：  1.90:1
所属分类：  人物 科技 
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