# Relationship history for MSHA mine 3301355

Current hierarchy: **Michael  Leister; Sonja  Leister → Select Materials → Select Materials-Millwood Operation**

- 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:** Pioneer Sands LLC → Select Materials-Millwood Operation; 1950-01-01 to 2019-02-07; source msha-controller-operator-history
- **controller_controls_mine:** Oglebay Norton Company → Select Materials-Millwood Operation; 1950-01-01 to 2008-02-12; source msha-controller-operator-history
- **controller_controls_operator:** Oglebay Norton Company → Pioneer Sands LLC; 1950-01-01 to 2008-02-12; source msha-controller-operator-history
- **controller_controls_mine:** Carmeuse Holding SA → Select Materials-Millwood Operation; 2008-02-13 to 2012-04-01; source msha-controller-operator-history
- **controller_controls_operator:** Carmeuse Holding SA → Pioneer Sands LLC; 2008-02-13 to 2012-04-01; source msha-controller-operator-history
- **controller_controls_mine:** Pioneer Natural Resources USA Incorporated → Select Materials-Millwood Operation; 2012-04-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pioneer Natural Resources USA Incorporated → Pioneer Sands LLC; 2012-04-02 to 2019-02-07; source msha-controller-operator-history
- **operator_operates_mine:** Select Materials → Select Materials-Millwood Operation; 2019-02-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Sonja  Leister et al → Select Materials-Millwood Operation; 2019-02-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sonja  Leister et al → Select Materials; 2019-02-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Leister et al → Select Materials; 2019-02-08 to current/open; source msha-controller-operator-history