# Relationship history for MSHA mine 4406018

Current hierarchy: **W Paul  Turner; Peggy T  Turner → Phoenix Coal Company Inc → No 4 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

- **controller_controls_mine:** Peggy T  Turner  et al → No 4 Strip; 1981-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Phoenix Coal Company Inc → No 4 Strip; 1983-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Peggy T  Turner  et al → Phoenix Coal Company Inc; 1983-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** W Paul  Turner  et al → Phoenix Coal Company Inc; 1983-08-01 to current/open; source msha-controller-operator-history