# Relationship history for MSHA mine 4002863

Current hierarchy: **Dunwoody Bill → Dunwoody Coal Company → No 2**

- 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:** Shipley Jessie → No 2; 1977-12-01 to 1988-12-19; source msha-controller-operator-history
- **operator_operates_mine:** Jessie Shipley Coal Company → No 2; 1984-10-01 to 1988-12-19; source msha-controller-operator-history
- **controller_controls_operator:** Shipley Jessie → Jessie Shipley Coal Company; 1984-10-01 to 1988-12-19; source msha-controller-operator-history
- **operator_operates_mine:** Dunwoody Coal Company → No 2; 1988-12-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dunwoody Bill → No 2; 1988-12-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dunwoody Bill → Dunwoody Coal Company; 1988-12-20 to current/open; source msha-controller-operator-history