| Nicolas-Eugène Petitjean (1813–1879) - Founder of the lineage | Buyer of the forge in 1843. |
| Jules Jean-Claude Petitjean (1850–?) - Forgeron heir | Pursued paternal activity. |
| Camille Joseph Petitjean (1878–1952) - Forgeron from 1907 to 1952 | Directed the forge during its decline. |
| César Petitjean (1908–1985) - Last blacksmith | Giver of tools at the museum. |
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