# Relationship history for MSHA mine 1513563

Current hierarchy: **James River Coal Company → Kem Coal Company → No 8**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Kaneb Services Inc → No 8; 1978-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Highland Coal Inc → No 8; 1982-06-01 to 1985-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Kaneb Services Inc → Highland Coal Inc; 1982-06-01 to 1985-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Kem Coal Inc → No 8; 1985-07-01 to 1995-06-19; source msha-controller-operator-history
- **controller_controls_mine:** Williams Companies Inc → No 8; 1985-07-01 to 1995-06-19; source msha-controller-operator-history
- **controller_controls_operator:** Williams Companies Inc → Kem Coal Inc; 1985-07-01 to 1995-06-19; source msha-controller-operator-history
- **operator_operates_mine:** Kem Coal Company → No 8; 1995-06-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James River Coal Company → No 8; 1995-06-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James River Coal Company → Kem Coal Company; 1995-06-20 to current/open; source msha-controller-operator-history