# Relationship history for MSHA mine 4607026

Current hierarchy: **Bays David → Anna B Mining Inc → Medo No 1 Strip**

- 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:** Raider Run Coal Company Inc → Medo No 1 Strip; 1985-11-01 to 1987-09-02; source msha-controller-operator-history
- **controller_controls_mine:** Fraley Jerry L → Medo No 1 Strip; 1985-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fraley Jerry L → Raider Run Coal Company Inc; 1985-11-01 to 1987-09-02; source msha-controller-operator-history
- **operator_operates_mine:** Caroll Mining Company Inc → Medo No 1 Strip; 1987-09-03 to 1988-09-14; source msha-controller-operator-history
- **controller_controls_mine:** Trivett Carolyn → Medo No 1 Strip; 1987-09-03 to 1988-09-21; source msha-controller-operator-history
- **controller_controls_operator:** Trivett Carolyn → Caroll Mining Company Inc; 1987-09-03 to 1988-09-14; source msha-controller-operator-history
- **operator_operates_mine:** Caroll Mining Company Inc → Medo No 1 Strip; 1988-09-15 to 1989-05-24; source msha-controller-operator-history
- **controller_controls_mine:** Fraley Jerry L → Medo No 1 Strip; 1988-09-15 to 1989-05-24; source msha-controller-operator-history
- **controller_controls_operator:** Fraley Jerry L → Caroll Mining Company Inc; 1988-09-15 to 1989-05-24; source msha-controller-operator-history
- **controller_controls_mine:** Bays David → Medo No 1 Strip; 1988-09-22 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Anna B Mining Inc → Medo No 1 Strip; 1989-05-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bays David → Anna B Mining Inc; 1989-05-25 to current/open; source msha-controller-operator-history