Joseph von Fraunhofer, Fraunhofer Society biography
= Joseph von Fraunhofer, Fraunhofer Society biography
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https://www.fraunhofer.de/en/about-fraunhofer/profile-structure/chronicles/joseph-von-fraunhofer.html
Institutional account, His Achievements: optical glass manufacture, diffraction gratings and use of dark solar lines as reproducible refraction standards. No individual byline or page publication date asserted.