# Relationship history for MSHA mine 4607312

Current hierarchy: **Murphy Wilson → W & F Coal Company Inc → Mine 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

- **operator_operates_mine:** Mouthcard Development Company Inc → Mine No 1; 1987-06-01 to 1987-08-25; source msha-controller-operator-history
- **controller_controls_mine:** Larry  Phillips → Mine No 1; 1987-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Larry  Phillips → Mouthcard Development Company Inc; 1987-06-01 to 1987-08-25; source msha-controller-operator-history
- **operator_operates_mine:** Dynasty Resources Inc → Mine No 1; 1987-08-26 to 1988-10-20; source msha-controller-operator-history
- **controller_controls_mine:** Joby  Fields → Mine No 1; 1987-08-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joby  Fields → Dynasty Resources Inc; 1987-08-26 to 1988-10-20; source msha-controller-operator-history
- **operator_operates_mine:** W & F Coal Company Inc → Mine No 1; 1988-10-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Murphy Wilson → Mine No 1; 1988-10-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Murphy Wilson → W & F Coal Company Inc; 1988-10-21 to current/open; source msha-controller-operator-history