# Relationship history for MSHA mine 1800646

Current hierarchy: **George R  Beener → Tri-Star Mining Inc → Clark Coal #7**

- 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:** Clark Donald W → Clark Coal #7; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Donald W Clark Coal Company → Clark Coal #7; 1977-08-01 to 1992-08-03; source msha-controller-operator-history
- **controller_controls_operator:** Clark Donald W → Donald W Clark Coal Company; 1977-08-01 to 1992-08-03; source msha-controller-operator-history
- **controller_controls_mine:** George R  Beener → Clark Coal #7; 1986-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Tri-Star Mining Inc → Clark Coal #7; 1992-08-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** George R  Beener → Tri-Star Mining Inc; 1992-08-04 to current/open; source msha-controller-operator-history