# Relationship history for MSHA mine 1515307

Current hierarchy: **Hurley Burton → Prater Branch Mining 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

- **controller_controls_mine:** Huston Hubert → No 1; 1984-06-29 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sharp Coal Company Inc → No 1; 1985-07-01 to 1986-02-19; source msha-controller-operator-history
- **controller_controls_operator:** Huston Hubert → Sharp Coal Company Inc; 1985-07-01 to 1986-02-19; source msha-controller-operator-history
- **operator_operates_mine:** Innovative Energies Inc → No 1; 1986-02-20 to 1986-12-08; source msha-controller-operator-history
- **controller_controls_mine:** Stacy Chuck Et Al → No 1; 1986-02-20 to 1986-12-08; source msha-controller-operator-history
- **controller_controls_operator:** Stacy Chuck Et Al → Innovative Energies Inc; 1986-02-20 to 1986-12-08; source msha-controller-operator-history
- **operator_operates_mine:** Skyco Coal Inc → No 1; 1986-12-09 to 1987-05-26; source msha-controller-operator-history
- **controller_controls_mine:** Allen G  Stump et al → No 1; 1986-12-09 to 1987-05-26; source msha-controller-operator-history
- **controller_controls_operator:** Allen G  Stump et al → Skyco Coal Inc; 1986-12-09 to 1987-05-26; source msha-controller-operator-history
- **operator_operates_mine:** R I B Coal Company Inc → No 1; 1987-05-27 to 1989-09-12; source msha-controller-operator-history
- **controller_controls_mine:** Hess Doug → No 1; 1987-05-27 to 1989-09-12; source msha-controller-operator-history
- **controller_controls_operator:** Hess Doug → R I B Coal Company Inc; 1987-05-27 to 1989-09-12; source msha-controller-operator-history
- **operator_operates_mine:** Prater Branch Mining Inc → No 1; 1989-09-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hurley Burton → No 1; 1989-09-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hurley Burton → Prater Branch Mining Inc; 1989-09-13 to current/open; source msha-controller-operator-history