# Relationship history for MSHA mine 4405251

Current hierarchy: **Francisco Bonnie → Skeens Fork Coal Company Inc → No 1**

- 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

- **operator_operates_mine:** Skeens Fork Coal Company Inc → No 1; 1979-07-01 to 1984-08-27; source msha-controller-operator-history
- **controller_controls_mine:** Boyd Darrell & Fred Sullivan → No 1; 1979-07-01 to 1984-08-27; source msha-controller-operator-history
- **controller_controls_operator:** Boyd Darrell & Fred Sullivan → Skeens Fork Coal Company Inc; 1979-07-01 to 1984-08-27; source msha-controller-operator-history
- **operator_operates_mine:** Skeens Fork Coal Company Inc → No 1; 1984-08-28 to 1987-02-25; source msha-controller-operator-history
- **controller_controls_mine:** Sullivan Dewey R → No 1; 1984-08-28 to 1987-02-25; source msha-controller-operator-history
- **controller_controls_operator:** Sullivan Dewey R → Skeens Fork Coal Company Inc; 1984-08-28 to 1987-02-25; source msha-controller-operator-history
- **operator_operates_mine:** Skeens Fork Coal Company Inc → No 1; 1987-02-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Francisco Bonnie → No 1; 1987-02-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Francisco Bonnie → Skeens Fork Coal Company Inc; 1987-02-26 to current/open; source msha-controller-operator-history