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== External links == | == External links == | ||
* [https://patents.google.com/patent/US568177 The ''Apparatus for Producing Ozone'' | * [https://patents.google.com/patent/US568177 The ''Apparatus for Producing Ozone'' on Google Patents] | ||
[[Category:Human technology]] | [[Category:Human technology]] | ||
[[Category:Technology from the real world]] | [[Category:Technology from the real world]] | ||
[[Category:Scientific instruments from the real world]] | [[Category:Scientific instruments from the real world]] | ||