# Relationship history for MSHA mine 4104541

Current hierarchy: **Rusty D  Stevens → WTL LLC → Portable screen plant**

- 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:** Lone Star Redi Mix → Portable screen plant; 2005-07-12 to 2008-02-27; source msha-controller-operator-history
- **controller_controls_mine:** Charlie  Emmons → Portable screen plant; 2005-07-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charlie  Emmons → Lone Star Redi Mix; 2005-07-12 to 2008-02-27; source msha-controller-operator-history
- **operator_operates_mine:** WTL LLC → Portable screen plant; 2008-02-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rusty D  Stevens → Portable screen plant; 2008-02-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rusty D  Stevens → WTL LLC; 2008-02-28 to current/open; source msha-controller-operator-history