# Relationship history for MSHA mine 4405246

Current hierarchy: **Nichols Cecil & Gary Keen → Double O Mining → Mine 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

- **controller_controls_mine:** Childers Walt C → Mine No 1; 1979-05-01 to 1981-08-17; source msha-controller-operator-history
- **operator_operates_mine:** Carol Coal Co Inc Of Tazewell County Va → Mine No 1; 1979-06-01 to 1980-02-20; source msha-controller-operator-history
- **controller_controls_operator:** Childers Walt C → Carol Coal Co Inc Of Tazewell County Va; 1979-06-01 to 1980-02-20; source msha-controller-operator-history
- **operator_operates_mine:** M C Coal Company → Mine No 1; 1980-02-21 to 1980-07-22; source msha-controller-operator-history
- **controller_controls_mine:** Mullins Clell → Mine No 1; 1980-02-21 to 1980-07-22; source msha-controller-operator-history
- **controller_controls_operator:** Mullins Clell → M C Coal Company; 1980-02-21 to 1980-07-22; source msha-controller-operator-history
- **operator_operates_mine:** Hoge & Woodmore Coal Company → Mine No 1; 1980-07-23 to 1985-09-29; source msha-controller-operator-history
- **controller_controls_mine:** Woodmore Charles & Kent Hoge → Mine No 1; 1980-07-23 to 1985-09-29; source msha-controller-operator-history
- **controller_controls_operator:** Woodmore Charles & Kent Hoge → Hoge & Woodmore Coal Company; 1980-07-23 to 1985-09-29; source msha-controller-operator-history
- **operator_operates_mine:** Double O Mining → Mine No 1; 1985-09-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Nichols Cecil & Gary Keen → Mine No 1; 1985-09-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nichols Cecil & Gary Keen → Double O Mining; 1985-09-30 to current/open; source msha-controller-operator-history