# Relationship history for MSHA mine 1512209

Current hierarchy: **James River Coal Company → Kem 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:** Edward L Clemons Estate → No 2; 1977-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Kem Coal Company Inc → No 2; 1980-01-01 to 1980-07-17; source msha-controller-operator-history
- **controller_controls_operator:** Edward L Clemons Estate → Kem Coal Company Inc; 1980-01-01 to 1980-07-17; source msha-controller-operator-history
- **controller_controls_mine:** Kem Coal Company Inc & Kresco Inc → No 2; 1980-02-22 to 1981-06-24; source msha-controller-operator-history
- **operator_operates_mine:** K & K Enterprises → No 2; 1980-07-18 to 1981-06-24; source msha-controller-operator-history
- **controller_controls_operator:** Kem Coal Company Inc & Kresco Inc → K & K Enterprises; 1980-07-18 to 1981-06-24; source msha-controller-operator-history
- **operator_operates_mine:** Kem Coal Inc → No 2; 1981-06-25 to 1985-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Kaneb Services Inc → No 2; 1981-06-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kaneb Services Inc → Kem Coal Inc; 1981-06-25 to 1985-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Kem Coal Inc → No 2; 1985-07-01 to 1995-06-19; source msha-controller-operator-history
- **controller_controls_mine:** Williams Companies Inc → No 2; 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 2; 1995-06-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James River Coal Company → No 2; 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