# Relationship history for MSHA mine 4300452

Current hierarchy: **Micheal  Fitzpatrick → Fitzpatrick Excavating → AUSTIN WESTERN 73E**

- 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

- **operator_operates_mine:** Fitzpatrick Excavating → AUSTIN WESTERN 73E; 1990-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Micheal  Fitzpatrick  et al → AUSTIN WESTERN 73E; 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