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1 Jan 1888 Jahr - 1888 Cement bifocals patented by US optometrist August Morck but Samuel Gregg had the idea earlier in 1866
Zugefügt zum Band der Zeit:
The development of optometry through the ages
By
Christian Pot
10 Apr 2021
0
0
766
Datum:
1 Jan 1888 Jahr
Jetzt
~ 137 years ago
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