# Relationship history for MSHA mine 1516806

Current hierarchy: **Brown Carl J → Wolf Creek Coal Company → Sullivan Underground**

- 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:** Brown Douglas E → Sullivan Underground; 1977-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mc Coy John P → Sullivan Underground; 1988-02-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Wolf Creek Mining Inc → Sullivan Underground; 1990-01-01 to 1990-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Brown Douglas E → Wolf Creek Mining Inc; 1990-01-01 to 1990-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Wolf Creek Coal Company → Sullivan Underground; 1990-11-01 to 1991-09-08; source msha-controller-operator-history
- **controller_controls_mine:** Brown Carl J → Sullivan Underground; 1990-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brown Carl J → Wolf Creek Coal Company; 1990-11-01 to 1991-09-08; source msha-controller-operator-history
- **operator_operates_mine:** Prosperity Mining Inc → Sullivan Underground; 1991-09-09 to 1991-11-06; source msha-controller-operator-history
- **controller_controls_operator:** Mc Coy John P → Prosperity Mining Inc; 1991-09-09 to 1991-11-06; source msha-controller-operator-history
- **operator_operates_mine:** Wolf Creek Coal Company → Sullivan Underground; 1991-11-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brown Carl J → Wolf Creek Coal Company; 1991-11-07 to current/open; source msha-controller-operator-history