# Relationship history for MSHA mine 3304334

Current hierarchy: **CRH PLC → Shelly Materials Inc → Alexandria 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:** Geiger Gravel Company → Alexandria Plant; 1994-06-01 to 1997-05-27; source msha-controller-operator-history
- **controller_controls_mine:** Steven M  Geiger → Alexandria Plant; 1994-06-01 to 1997-05-27; source msha-controller-operator-history
- **controller_controls_operator:** Steven M  Geiger → Geiger Gravel Company; 1994-06-01 to 1997-05-27; source msha-controller-operator-history
- **operator_operates_mine:** Eagle Material Supply Ltd → Alexandria Plant; 1997-05-28 to 2000-07-23; source msha-controller-operator-history
- **controller_controls_mine:** Rock  Van Wey  et al → Alexandria Plant; 1997-05-28 to 2000-07-23; source msha-controller-operator-history
- **controller_controls_operator:** Rock  Van Wey  et al → Eagle Material Supply Ltd; 1997-05-28 to 2000-07-23; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Alexandria Plant; 2000-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Eagle Material Supply Ltd → Alexandria Plant; 2000-07-24 to 2003-05-31; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Alexandria Plant; 2000-07-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Eagle Material Supply Ltd; 2000-07-24 to 2003-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Shelly Materials Inc → Alexandria Plant; 2003-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Shelly Materials Inc; 2003-06-01 to current/open; source msha-controller-operator-history