# Relationship history for MSHA mine 4404946

Current hierarchy: **Alpha Natural Resources, Inc. → Black Dog Coal Corporation → 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Pittston Company → No 2; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Clinchfield Coal Company → No 2; 1977-10-01 to 2002-12-12; source msha-controller-operator-history
- **controller_controls_operator:** Pittston Company → Clinchfield Coal Company; 1977-10-01 to 2002-12-12; source msha-controller-operator-history
- **controller_controls_mine:** Ronnie A  Edwards → No 2; 1993-11-16 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Dickenson-Russell Coal Company, LLC → No 2; 2002-12-13 to 2003-04-23; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources, Inc. → No 2; 2002-12-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources, Inc. → Dickenson-Russell Coal Company, LLC; 2002-12-13 to 2003-04-23; source msha-controller-operator-history
- **operator_operates_mine:** Black Dog Coal Corp → No 2; 2003-04-24 to 2005-01-31; source msha-controller-operator-history
- **controller_controls_operator:** Ronnie A  Edwards → Black Dog Coal Corp; 2003-04-24 to 2005-01-31; source msha-controller-operator-history
- **operator_operates_mine:** Black Dog Coal Corporation → No 2; 2005-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources, Inc. → No 2; 2005-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources, Inc. → Black Dog Coal Corporation; 2005-02-01 to current/open; source msha-controller-operator-history