# Relationship history for MSHA mine 1510813

Current hierarchy: **Wombles James R → Williamsburg Coal Company Inc → Williamsburg Coal Co Inc**

- 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:** T K G Coal Company → Williamsburg Coal Co Inc; 1977-09-01 to 1983-12-20; source msha-controller-operator-history
- **controller_controls_mine:** Thornberry Rennie - Earl Et Al → Williamsburg Coal Co Inc; 1977-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thornberry Rennie - Earl Et Al → T K G Coal Company; 1977-09-01 to 1983-12-20; source msha-controller-operator-history
- **controller_controls_mine:** Wombles Henry → Williamsburg Coal Co Inc; 1981-09-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mary D Corp → Williamsburg Coal Co Inc; 1983-12-21 to 1984-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Wombles Henry → Mary D Corp; 1983-12-21 to 1984-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Williamsburg Coal Company Inc → Williamsburg Coal Co Inc; 1985-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Wombles James R → Williamsburg Coal Co Inc; 1985-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wombles James R → Williamsburg Coal Company Inc; 1985-01-01 to current/open; source msha-controller-operator-history