- Get nitrogen (N) from air
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In 1901, he began researching the separation of liquid oxygen and liquid nitrogen by distilling liquefied air, and in 1910, together with his son Friedrich, he perfected the Linde double-column method, which has been improved and is still used today.
- [Carl von Linde - Wikipedia https://ja.wikipedia.org/wiki/%E3%82%AB%E3%83%BC%E3%83%AB%E3%83%BB%E3%83%95%E3%82%A9%E3%83%B3%E3%83%BB%E3%83 %AA%E3%83%B3%E3%83%87]
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