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23 magg 1920 anni - Calvin Goddard was the creator of the comparison microscope. Because of his invention, two pieces of specimen can be compared and viewed at once.

Aggiunto al nastro di tempo:

Forensic

ByCaroline Long
25 set 2017

Data:

23 magg 1920 anni
Adesso
~ 104 years ago

Immagini:

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