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Date: 14/06/1854
From: Ferdinand Piercot, ministre de l'Intérieur
To: A. Quetelet
Date: 15/06/1854
From: Laurent, ingénieur opticien
To: A. Quetelet
Date: 16/06/1854
From: T. Ertel & Sohn, fabricants d’instruments
To: A. Quetelet
Date: 17/06/1854
From: Ferdinand Piercot, ministre de l'Intérieur
To: A. Quetelet
Date: 21/06/1854
From: Ferdinand Piercot, ministre de l'Intérieur
To: A. Quetelet
Date: 23/06/1854
From: A. Quetelet
To: Ferdinand Piercot, ministre de l'Intérieur
Date: 23/06/1854
From: Edouard Sacré, ingénieur mécanicien
To: A. Quetelet
Date: 24/06/1854
From: A. Quetelet
To: Ferdinand Piercot, ministre de l'Intérieur