# Relationship history for MSHA mine 1513892

Current hierarchy: **King Henry C & Curtis W → C & H 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

- **operator_operates_mine:** B B & H Inc → No 2; 1983-01-01 to 1984-02-06; source msha-controller-operator-history
- **controller_controls_mine:** Ballengee James W → No 2; 1983-01-01 to 1984-02-06; source msha-controller-operator-history
- **controller_controls_operator:** Ballengee James W → B B & H Inc; 1983-01-01 to 1984-02-06; source msha-controller-operator-history
- **operator_operates_mine:** Ivaco Coal Company Inc → No 2; 1984-02-07 to 1985-02-09; source msha-controller-operator-history
- **controller_controls_mine:** Baker Gary N → No 2; 1984-02-07 to 1985-08-25; source msha-controller-operator-history
- **controller_controls_operator:** Baker Gary N → Ivaco Coal Company Inc; 1984-02-07 to 1985-02-09; source msha-controller-operator-history
- **controller_controls_mine:** King Henry C & Curtis W Et Al → No 2; 1984-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** C & H Coal Company → No 2; 1985-02-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** King Henry C & Curtis W Et Al → C & H Coal Company; 1985-02-10 to current/open; source msha-controller-operator-history