- inverted l calender
- 倒l型砑光机
English-Chinese lightIndusrty dictionary (英汉轻工业大词典). 2013.
English-Chinese lightIndusrty dictionary (英汉轻工业大词典). 2013.
Timeline of temperature and pressure measurement technology — A history of temperature measurement and pressure measurement technology.Timeline800s* 800s mdash; Differential pressure controls developed by the Banū Mūsā brothers. [citation|title=Ancient Discoveries, Episode 12: Machines of the East|publisher … Wikipedia
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