# Relationship history for MSHA mine 4406644

Current hierarchy: **SunCoke Energy Incorporated → Dominion Coal Corporation → Dominion No 21**

- 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:** Sunoco, Inc. → Dominion No 21; 1979-10-29 to 2012-01-16; source msha-controller-operator-history
- **operator_operates_mine:** Dominion Coal Corporation → Dominion No 21; 1991-05-01 to 1998-01-18; source msha-controller-operator-history
- **controller_controls_operator:** Sunoco, Inc. → Dominion Coal Corporation; 1991-05-01 to 1998-01-18; source msha-controller-operator-history
- **controller_controls_mine:** Robert P  Ratliff → Dominion No 21; 1995-10-30 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Rat Contractors Inc → Dominion No 21; 1998-01-19 to 1998-05-04; source msha-controller-operator-history
- **controller_controls_operator:** Robert P  Ratliff → Rat Contractors Inc; 1998-01-19 to 1998-05-04; source msha-controller-operator-history
- **operator_operates_mine:** Dominion Coal Corporation → Dominion No 21; 1998-05-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sunoco, Inc. → Dominion Coal Corporation; 1998-05-05 to 2012-01-16; source msha-controller-operator-history
- **controller_controls_mine:** SunCoke Energy Incorporated → Dominion No 21; 2012-01-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** SunCoke Energy Incorporated → Dominion Coal Corporation; 2012-01-17 to 1998-01-18; source msha-controller-operator-history
- **controller_controls_operator:** SunCoke Energy Incorporated → Dominion Coal Corporation; 2012-01-17 to current/open; source msha-controller-operator-history