# Relationship history for MSHA mine 4405491

Current hierarchy: **Mullins White Jr → Mullins & Skeens Coal Company Inc → 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:** Bill G  Humphreys → No 2; 1978-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Shelton Coal Corp → No 2; 1980-08-01 to 1981-06-03; source msha-controller-operator-history
- **controller_controls_operator:** Bill G  Humphreys → Shelton Coal Corp; 1980-08-01 to 1981-06-03; source msha-controller-operator-history
- **operator_operates_mine:** Don B Coal Inc → No 2; 1981-06-04 to 1982-07-21; source msha-controller-operator-history
- **controller_controls_mine:** Boliek Donald B → No 2; 1981-06-04 to 1982-07-21; source msha-controller-operator-history
- **controller_controls_operator:** Boliek Donald B → Don B Coal Inc; 1981-06-04 to 1982-07-21; source msha-controller-operator-history
- **operator_operates_mine:** B & J Coal Company Inc → No 2; 1982-07-22 to 1985-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Darvin  Rowe et al → No 2; 1982-07-22 to 1985-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Darvin  Rowe et al → B & J Coal Company Inc; 1982-07-22 to 1985-05-31; source msha-controller-operator-history
- **operator_operates_mine:** B & J Coal Company Inc → No 2; 1985-06-01 to 1986-03-05; source msha-controller-operator-history
- **controller_controls_mine:** Bruce  Hagerman → No 2; 1985-06-01 to 1986-03-05; source msha-controller-operator-history
- **controller_controls_operator:** Bruce  Hagerman → B & J Coal Company Inc; 1985-06-01 to 1986-03-05; source msha-controller-operator-history
- **controller_controls_mine:** Mullins White Jr → No 2; 1985-07-08 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mullins & Skeens Coal Company Inc → No 2; 1986-03-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mullins White Jr → Mullins & Skeens Coal Company Inc; 1986-03-06 to current/open; source msha-controller-operator-history