# Relationship history for MSHA mine 4202120

Current hierarchy: **JD  Evans → Erock Inc → IRONTON**

- 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:** Evans Grader & Paving → IRONTON; 1995-07-01 to 2021-07-27; source msha-controller-operator-history
- **controller_controls_mine:** Jaime  Evans  et al → IRONTON; 1995-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jaime  Evans  et al → Evans Grader & Paving; 1995-07-01 to 2021-07-27; source msha-controller-operator-history
- **controller_controls_operator:** Terry  Evans  et al → Evans Grader & Paving; 1995-07-01 to 2021-07-27; source msha-controller-operator-history
- **operator_operates_mine:** Evans Rock Products → IRONTON; 2021-07-28 to 2024-01-09; source msha-controller-operator-history
- **controller_controls_mine:** Jaime  Evans  et al → IRONTON; 2021-07-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jaime  Evans  et al → Evans Rock Products; 2021-07-28 to 2024-01-09; source msha-controller-operator-history
- **controller_controls_operator:** Terry  Evans  et al → Evans Rock Products; 2021-07-28 to 2024-01-09; source msha-controller-operator-history
- **operator_operates_mine:** Erock Inc → IRONTON; 2024-01-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** JD  Evans → IRONTON; 2024-01-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** JD  Evans → Erock Inc; 2024-01-10 to current/open; source msha-controller-operator-history