# Relationship history for MSHA mine 1506243

Current hierarchy: **Evans Davis → E & M Coals 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:** Howell Branch Coal Company → #1; 1973-01-01 to 1977-11-17; source msha-controller-operator-history
- **controller_controls_mine:** Howell Emitt → #1; 1973-01-01 to 1977-11-17; source msha-controller-operator-history
- **controller_controls_operator:** Howell Emitt → Howell Branch Coal Company; 1973-01-01 to 1977-11-17; source msha-controller-operator-history
- **operator_operates_mine:** Morgue Branch Coal Company Inc → #1; 1977-11-18 to 1985-08-12; source msha-controller-operator-history
- **controller_controls_mine:** Little Paul E → #1; 1977-11-18 to 1985-08-12; source msha-controller-operator-history
- **controller_controls_operator:** Little Paul E → Morgue Branch Coal Company Inc; 1977-11-18 to 1985-08-12; source msha-controller-operator-history
- **operator_operates_mine:** Rock Bridge Coal Corp Inc → #1; 1985-08-13 to 1989-01-04; source msha-controller-operator-history
- **controller_controls_mine:** Howell Joe Jr → #1; 1985-08-13 to 1989-01-04; source msha-controller-operator-history
- **controller_controls_operator:** Howell Joe Jr → Rock Bridge Coal Corp Inc; 1985-08-13 to 1989-01-04; source msha-controller-operator-history
- **controller_controls_mine:** Tackett John G → #1; 1986-01-20 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Tackett & Spears Coal Company Inc → #1; 1989-01-05 to 1990-05-10; source msha-controller-operator-history
- **controller_controls_operator:** Tackett John G → Tackett & Spears Coal Company Inc; 1989-01-05 to 1990-05-10; source msha-controller-operator-history
- **operator_operates_mine:** E & M Coals Inc → #1; 1990-05-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Evans Davis → #1; 1990-05-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Evans Davis → E & M Coals Inc; 1990-05-11 to current/open; source msha-controller-operator-history