Opening of the Institute for Photographic Portraiture and Teaching ( Photographische Porträt- und Lehranstalt ).
Begins to work with the wet collodion process.
1853
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Erste Arbeiten mit der Collodium-Trockenplatte. Krone wird Kommissär für photographische Objektive der Königlich privilegierten Optischen Industrie-Anstalt in Rathenow.
1850er/60er
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First trials with collodion dry plates.Krone is designated agent for photographic lenses at the Royally Appointed Optical Industrial Institute (Königlich privilegierte Optische Industrie-Anstalt) in Rathenow.
1850's/60's
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