# Relationship history for MSHA mine 3603187

Current hierarchy: **Ennstone PLC → Atlantic States Materials Of Pa Inc → HILL 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:** H W Cooper Builders Supply Inc → HILL PLANT; 1950-01-01 to 1985-09-16; source msha-controller-operator-history
- **controller_controls_mine:** Glenn E  Cooper → HILL PLANT; 1950-01-01 to 1985-09-16; source msha-controller-operator-history
- **controller_controls_operator:** Glenn E  Cooper → H W Cooper Builders Supply Inc; 1950-01-01 to 1985-09-16; source msha-controller-operator-history
- **operator_operates_mine:** H W Cooper Builders Supply Company Inc → HILL PLANT; 1985-09-17 to 1999-02-07; source msha-controller-operator-history
- **controller_controls_mine:** Charles  Santone → HILL PLANT; 1985-09-17 to 1999-02-07; source msha-controller-operator-history
- **controller_controls_operator:** Charles  Santone → H W Cooper Builders Supply Company Inc; 1985-09-17 to 1999-02-07; source msha-controller-operator-history
- **controller_controls_mine:** Ennstone PLC → HILL PLANT; 1997-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Atlantic States Materials Of Pa Inc → HILL PLANT; 1999-02-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ennstone PLC → Atlantic States Materials Of Pa Inc; 1999-02-08 to current/open; source msha-controller-operator-history