# Relationship history for MSHA mine 3603200

Current hierarchy: **Ennstone PLC → Atlantic States Materials of PA Inc → Southern Region Mahoning**

- 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:** Mahoning Valley Sand Company → Southern Region Mahoning; 1950-01-01 to 1990-05-16; source msha-controller-operator-history
- **controller_controls_mine:** Angelo  Medure → Southern Region Mahoning; 1950-01-01 to 1990-05-16; source msha-controller-operator-history
- **controller_controls_operator:** Angelo  Medure → Mahoning Valley Sand Company; 1950-01-01 to 1990-05-16; source msha-controller-operator-history
- **operator_operates_mine:** Mahoning Valley Aggregates → Southern Region Mahoning; 1990-05-17 to 1996-04-03; source msha-controller-operator-history
- **controller_controls_mine:** Warren L  Smith → Southern Region Mahoning; 1990-05-17 to 1996-04-03; source msha-controller-operator-history
- **controller_controls_operator:** Warren L  Smith → Mahoning Valley Aggregates; 1990-05-17 to 1996-04-03; source msha-controller-operator-history
- **operator_operates_mine:** Russell Minerals (Pa) Inc → Southern Region Mahoning; 1996-04-04 to 2001-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Alexander Russell Plc → Southern Region Mahoning; 1996-04-04 to 2001-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Alexander Russell Plc → Russell Minerals (Pa) Inc; 1996-04-04 to 2001-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Ennstone PLC → Southern Region Mahoning; 1997-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Atlantic States Materials of PA Inc → Southern Region Mahoning; 2001-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ennstone PLC → Atlantic States Materials of PA Inc; 2001-05-01 to current/open; source msha-controller-operator-history