# Relationship history for MSHA mine 3000214

Current hierarchy: **CRH PLC → Dolomite Group → Bath 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:** Blades Construction Products Corp → Bath Plant; 1950-01-01 to 2010-04-11; source msha-controller-operator-history
- **controller_controls_mine:** Robert U  Blades Jr → Bath Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert U  Blades Jr → Blades Construction Products Corp; 1950-01-01 to 2010-04-11; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Bath Plant; 2000-06-14 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Dolomite Group → Bath Plant; 2010-04-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Dolomite Group; 2010-04-12 to current/open; source msha-controller-operator-history