The Industrial Heritage in Taiwan
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* Helical tooth
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Helical tooth
 
Wood mold for foundry work--used around the 60s  
2½" flange valve  
The female uniform of Rongsu (pants)  
A screw bolt  
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Helical tooth ABOUT >>
Source: CPC Corporation, Taiwan (the original is in the exhibition hall of the Kaohsiung Oil Refinery) 
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