# Relationship history for MSHA mine 2301266

Current hierarchy: **Nathan  McKean; Jimmy W  Gibson → Politte Ready Mix LLC → Waco Materials Pit and 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Waco Materials Inc → Waco Materials Pit and Plant; 1950-01-01 to 1981-07-13; source msha-controller-operator-history
- **controller_controls_mine:** Andrew J  Agers → Waco Materials Pit and Plant; 1950-01-01 to 1981-07-13; source msha-controller-operator-history
- **controller_controls_operator:** Andrew J  Agers → Waco Materials Inc; 1950-01-01 to 1981-07-13; source msha-controller-operator-history
- **operator_operates_mine:** Politte Ready Mix LLC → Waco Materials Pit and Plant; 1981-07-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Nathan  McKean et al → Waco Materials Pit and Plant; 1981-07-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nathan  McKean et al → Politte Ready Mix LLC; 1981-07-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jimmy W  Gibson et al → Politte Ready Mix LLC; 1981-07-14 to current/open; source msha-controller-operator-history