1 янв 1936 г. - The Beckman pH meter
is released
Описание:
The meter was produced in order to find a better way to measure the pH of solutions. Beckman fit all of the needed instrumentation in a nice small box.
https://www.acs.org/content/acs/en/education/whatischemistry/landmarks/beckman.html
Добавлено на ленту времени:
CH 345 Timeline
Дата:
Изображения:
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