# Relationship history for MSHA mine 4801760

Current hierarchy: **Phillip G  Lyman; Kelly L  Olney → Lyman Ranches → Screen**

- 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:** Lyman Ranches → Screen; 2011-10-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Phillip G  Lyman et al → Screen; 2011-10-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Phillip G  Lyman et al → Lyman Ranches; 2011-10-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kelly L  Olney et al → Lyman Ranches; 2011-10-25 to current/open; source msha-controller-operator-history