# Relationship history for MSHA mine 0201941

Current hierarchy: **Edward C  Levy Jr → Mesa Materials Inc → Mesa 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:** Asphalt Mining & Concrete Company → Mesa Plant; 1979-01-01 to 1984-04-23; source msha-controller-operator-history
- **controller_controls_mine:** Threse  Sanders → Mesa Plant; 1979-01-01 to 1984-04-23; source msha-controller-operator-history
- **controller_controls_operator:** Threse  Sanders → Asphalt Mining & Concrete Company; 1979-01-01 to 1984-04-23; source msha-controller-operator-history
- **operator_operates_mine:** Amcon Materials Company Inc → Mesa Plant; 1984-04-24 to 1986-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Rein-Schultz & Dahl Of Illinois Inc → Mesa Plant; 1984-04-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rein-Schultz & Dahl Of Illinois Inc → Amcon Materials Company Inc; 1984-04-24 to 1986-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Mesa Materials Inc → Mesa Plant; 1986-09-01 to 1987-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Rein-Schultz & Dahl Of Illinois Inc → Mesa Plant; 1986-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rein-Schultz & Dahl Of Illinois Inc → Mesa Materials Inc; 1986-09-01 to 1987-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Edward C  Levy Jr et al → Mesa Plant; 1987-04-24 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mesa Materials Inc → Mesa Plant; 1987-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Edward C  Levy Jr et al → Mesa Materials Inc; 1987-08-01 to current/open; source msha-controller-operator-history