# Relationship history for MSHA mine 3610028

Current hierarchy: **Fairchild Brothers Holding Company → IA Construction → Mascharka**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Colas S A → Mascharka; 1950-01-01 to 2026-02-19; source msha-controller-operator-history
- **operator_operates_mine:** IA Construction → Mascharka; 2012-10-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Colas S A → IA Construction; 2012-10-22 to 2026-02-19; source msha-controller-operator-history
- **controller_controls_mine:** Fairchild Brothers Holding Company → Mascharka; 2026-02-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fairchild Brothers Holding Company → IA Construction; 2026-02-20 to current/open; source msha-controller-operator-history