# Relationship history for MSHA mine 3609284

Current hierarchy: **J Clifford  Forrest III → Rosebud Mining Company → Armstrong Co Surface**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** J Clifford  Forrest III → Armstrong Co Surface; 1979-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources, Inc. → Armstrong Co Surface; 2003-03-11 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** AMFIRE Mining Company LLC → Armstrong Co Surface; 2004-12-08 to 2014-12-29; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources, Inc. → AMFIRE Mining Company LLC; 2004-12-08 to 2014-12-29; source msha-controller-operator-history
- **operator_operates_mine:** Rosebud Mining Company → Armstrong Co Surface; 2014-12-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** J Clifford  Forrest III → Rosebud Mining Company; 2014-12-30 to current/open; source msha-controller-operator-history