# Relationship history for MSHA mine 1514953

Current hierarchy: **Curtis  Francis → Big Hill Mining Inc → No 3a**

- 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:** Curtis  Francis → No 3a; 1982-03-31 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Big Hickory Coal Company → No 3a; 1984-11-01 to 1985-08-29; source msha-controller-operator-history
- **controller_controls_mine:** Allen G  Stump et al → No 3a; 1984-11-01 to 1985-08-29; source msha-controller-operator-history
- **controller_controls_operator:** Allen G  Stump et al → Big Hickory Coal Company; 1984-11-01 to 1985-08-29; source msha-controller-operator-history
- **operator_operates_mine:** Little Oak Coal Corp → No 3a; 1985-08-30 to 1986-04-27; source msha-controller-operator-history
- **controller_controls_mine:** Fields Mason & Larry Ratliff → No 3a; 1985-08-30 to 1986-04-27; source msha-controller-operator-history
- **controller_controls_operator:** Fields Mason & Larry Ratliff → Little Oak Coal Corp; 1985-08-30 to 1986-04-27; source msha-controller-operator-history
- **operator_operates_mine:** Double E Mining Inc → No 3a; 1986-04-28 to 1990-10-04; source msha-controller-operator-history
- **controller_controls_mine:** Endicott Shelby R → No 3a; 1986-04-28 to 1990-10-04; source msha-controller-operator-history
- **controller_controls_operator:** Endicott Shelby R → Double E Mining Inc; 1986-04-28 to 1990-10-04; source msha-controller-operator-history
- **operator_operates_mine:** Big Hill Mining Inc → No 3a; 1990-10-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Curtis  Francis → Big Hill Mining Inc; 1990-10-05 to current/open; source msha-controller-operator-history