# Relationship history for MSHA mine 4300450

Current hierarchy: **Micheal  Fitzpatrick → Fitzpatrick Excavating → C-12 Extec**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Fitzpatrick Excavating → C-12 Extec; 1990-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Micheal  Fitzpatrick  et al → C-12 Extec; 1990-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Micheal  Fitzpatrick  et al → Fitzpatrick Excavating; 1990-03-01 to current/open; source msha-controller-operator-history