File:Pierre-Louis Guinand dessin d’un four destiné à la préparation du verre optique.jpg

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Deutsch: Pierre-Louis Guinand (1748–1824): Zeichnung eines Schmelzofens zur Herstellung von optischem Glas. Privatsammlung, Les Brenets. Aus Pierre-Arnold Borel: Branche de Pierre Louis Guinand 1748-1824, le célèbre opticien, communier des Brenets et des Ponts-de-Martel, bourgeois de Valangin. In: Familienforschung Schweiz, Jahrbuch 2002, S. 162–171, hier: S. 165.
Date early 19th century
date QS:P,+1850-00-00T00:00:00Z/7,P4241,Q40719727
Source https://www.e-periodica.ch/cntmng?pid=fsj-004:2002:0::207
Author Pierre-Louis Guinand (1748–1824)

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