# Relationship history for MSHA mine 1514522

Current hierarchy: **Mays Neil → Kevin Coal Inc → No1 Prep Plant**

- 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:** Erico Processing Inc → No1 Prep Plant; 1984-04-01 to 1988-06-08; source msha-controller-operator-history
- **controller_controls_mine:** Quesenberry Gerald Et Al → No1 Prep Plant; 1984-04-01 to 1988-06-08; source msha-controller-operator-history
- **controller_controls_operator:** Quesenberry Gerald Et Al → Erico Processing Inc; 1984-04-01 to 1988-06-08; source msha-controller-operator-history
- **controller_controls_mine:** Mays Neil → No1 Prep Plant; 1987-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Kevin Coal Inc → No1 Prep Plant; 1988-06-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mays Neil → Kevin Coal Inc; 1988-06-09 to current/open; source msha-controller-operator-history