# Relationship history for MSHA mine 2902149

Current hierarchy: **CRH PLC → Waycor Materials → Sandia  Pit**

- 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:** Albuquerque Rock Products Inc → Sandia  Pit; 1995-06-01 to 1999-02-27; source msha-controller-operator-history
- **controller_controls_mine:** James B  Shiver → Sandia  Pit; 1995-06-01 to 1999-02-27; source msha-controller-operator-history
- **controller_controls_operator:** James B  Shiver → Albuquerque Rock Products Inc; 1995-06-01 to 1999-02-27; source msha-controller-operator-history
- **operator_operates_mine:** Waycor Materials → Sandia  Pit; 1999-02-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Sandia  Pit; 1999-02-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Waycor Materials; 1999-02-28 to current/open; source msha-controller-operator-history