# Relationship history for MSHA mine 4104099

Current hierarchy: **J E  Willingham IV → 8-Mile Ranch Inc → Leona Rock Quarry**

- 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:** J & A Enterprize → Leona Rock Quarry; 1999-08-01 to 1999-11-23; source msha-controller-operator-history
- **controller_controls_mine:** George  McDonald et al → Leona Rock Quarry; 1999-08-01 to 1999-11-23; source msha-controller-operator-history
- **controller_controls_operator:** George  McDonald et al → J & A Enterprize; 1999-08-01 to 1999-11-23; source msha-controller-operator-history
- **operator_operates_mine:** 8-Mile Ranch Inc → Leona Rock Quarry; 1999-11-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** J E  Willingham IV → Leona Rock Quarry; 1999-11-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** J E  Willingham IV → 8-Mile Ranch Inc; 1999-11-24 to current/open; source msha-controller-operator-history