# Relationship history for MSHA mine 1514715

Current hierarchy: **Nicholson Gene & Lowern Hayre → Nicholson Coal Company → No 1 Surface**

- 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:** Root Construction Company → No 1 Surface; 1984-07-01 to 1984-10-30; source msha-controller-operator-history
- **controller_controls_mine:** Root Melvin & Carl Nicholson → No 1 Surface; 1984-07-01 to 1984-10-30; source msha-controller-operator-history
- **controller_controls_operator:** Root Melvin & Carl Nicholson → Root Construction Company; 1984-07-01 to 1984-10-30; source msha-controller-operator-history
- **operator_operates_mine:** Nicholson Coal Company → No 1 Surface; 1984-10-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Nicholson Gene & Lowern Hayre → No 1 Surface; 1984-10-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nicholson Gene & Lowern Hayre → Nicholson Coal Company; 1984-10-31 to current/open; source msha-controller-operator-history