# Relationship history for MSHA mine 1516690

Current hierarchy: **Adkins Estil → Ocelet Coal Company Inc → 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

- **controller_controls_mine:** Mays Neil → No 1 Surface; 1987-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Kevin Coal Inc → No 1 Surface; 1989-07-01 to 1990-01-08; source msha-controller-operator-history
- **controller_controls_operator:** Mays Neil → Kevin Coal Inc; 1989-07-01 to 1990-01-08; source msha-controller-operator-history
- **operator_operates_mine:** Ocelet Coal Company Inc → No 1 Surface; 1990-01-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Adkins Estil → No 1 Surface; 1990-01-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Adkins Estil → Ocelet Coal Company Inc; 1990-01-09 to current/open; source msha-controller-operator-history