| Stéphane Boulin - Departmental architect | Author of the first plans (1881-1886). |
| Jh. Charles - Architect in Roanne | Designed the project selected in 1888. |
| Julien Gatier et Jean Sarély - Entrepreneurs | Perform the work (1890-1893). |
| Société la Diana - Scientific Society | It opposes partial destruction. |
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