# Relationship history for MSHA mine 4406931

Current hierarchy: **Mark  Elliott → Ennstone Inc → Albion 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

- **controller_controls_mine:** Ennstone PLC → Albion Plant; 1997-07-29 to 2009-06-10; source msha-controller-operator-history
- **operator_operates_mine:** Rappahannock Geological Products Inc → Albion Plant; 1998-05-01 to 2003-10-09; source msha-controller-operator-history
- **controller_controls_mine:** Hunter  Greenlaw Jr → Albion Plant; 1998-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hunter  Greenlaw Jr → Rappahannock Geological Products Inc; 1998-05-01 to 2003-10-09; source msha-controller-operator-history
- **operator_operates_mine:** Ennstone Inc → Albion Plant; 2003-10-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ennstone PLC → Ennstone Inc; 2003-10-10 to 2009-06-10; source msha-controller-operator-history
- **controller_controls_mine:** Mark  Elliott → Albion Plant; 2009-06-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mark  Elliott → Ennstone Inc; 2009-06-11 to current/open; source msha-controller-operator-history