# Relationship history for MSHA mine 3603164

Current hierarchy: **Mark  Elliott → Three Rivers Aggregates → Darlington**

- 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:** Darlington Ready Mix Company → Darlington; 1950-01-01 to 2001-02-04; source msha-controller-operator-history
- **controller_controls_mine:** Alexander Russell Plc → Darlington; 1950-01-01 to 2001-02-04; source msha-controller-operator-history
- **controller_controls_operator:** Alexander Russell Plc → Darlington Ready Mix Company; 1950-01-01 to 2001-02-04; source msha-controller-operator-history
- **controller_controls_mine:** Ennstone PLC → Darlington; 1997-07-29 to 2009-06-10; source msha-controller-operator-history
- **controller_controls_mine:** Ennstone PLC → Darlington; 1997-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Atlantic States Materials of PA Inc → Darlington; 2001-02-05 to 2006-05-14; source msha-controller-operator-history
- **controller_controls_operator:** Ennstone PLC → Atlantic States Materials of PA Inc; 2001-02-05 to 2006-05-14; source msha-controller-operator-history
- **operator_operates_mine:** Three Rivers Aggregates → Darlington; 2006-05-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ennstone PLC → Three Rivers Aggregates; 2006-05-15 to 2009-06-10; source msha-controller-operator-history
- **controller_controls_mine:** Mark  Elliott → Darlington; 2009-06-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mark  Elliott → Three Rivers Aggregates; 2009-06-11 to current/open; source msha-controller-operator-history