# Relationship history for MSHA mine 4406979

Current hierarchy: **James Wayne  Estep → Estep Coal Company Inc → Nme**

- 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:** James Wayne  Estep → Nme; 1981-07-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Estep Coal Company Inc → Nme; 2000-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James Wayne  Estep → Estep Coal Company Inc; 2000-01-01 to current/open; source msha-controller-operator-history