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4 Jan 1909 Jahr - С. Серенсен ввел водородный показатель рН.

Zugefügt zum Band der Zeit:

Великие открытия в ХХ веке.

ByЮра
13 Jun 2017

Datum:

4 Jan 1909 Jahr
Jetzt
~ 115 years ago

Abbildungen:

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