# Relationship history for MSHA mine 1517135

Current hierarchy: **O'Dean  Holbrook → Pam The Bear Coal Company Inc → #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

- **operator_operates_mine:** Jac Coal Company Inc → #1; 1991-09-01 to 1992-02-11; source msha-controller-operator-history
- **controller_controls_mine:** Fields Ray → #1; 1991-09-01 to 1992-02-11; source msha-controller-operator-history
- **controller_controls_operator:** Fields Ray → Jac Coal Company Inc; 1991-09-01 to 1992-02-11; source msha-controller-operator-history
- **operator_operates_mine:** Jac Coal Company Inc → #1; 1992-02-12 to 1992-08-09; source msha-controller-operator-history
- **controller_controls_mine:** Stumbo Harry → #1; 1992-02-12 to 1992-08-09; source msha-controller-operator-history
- **controller_controls_operator:** Stumbo Harry → Jac Coal Company Inc; 1992-02-12 to 1992-08-09; source msha-controller-operator-history
- **operator_operates_mine:** Pam The Bear Coal Company Inc → #1; 1992-08-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** O'Dean  Holbrook → #1; 1992-08-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** O'Dean  Holbrook → Pam The Bear Coal Company Inc; 1992-08-10 to current/open; source msha-controller-operator-history