# Relationship history for MSHA mine 3609179

Current hierarchy: **Wally T  Fetterolf → W T Fetterolf Coal Co → Locustdale Strip Mine**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Wally T  Fetterolf → Locustdale Strip Mine; 2001-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** W T Fetterolf Coal Co → Locustdale Strip Mine; 2003-11-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wally T  Fetterolf → W T Fetterolf Coal Co; 2003-11-14 to current/open; source msha-controller-operator-history