# Relationship history for MSHA mine 0503850

Current hierarchy: **CRH PLC → Oldcastle SW Group, Inc. → CR 6**

- 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:** Ken W  Nesbitt → CR 6; 1950-01-01 to 1998-01-04; source msha-controller-operator-history
- **operator_operates_mine:** United Companies Of Mesa County Inc → CR 6; 1983-05-01 to 1998-01-04; source msha-controller-operator-history
- **controller_controls_operator:** Ken W  Nesbitt → United Companies Of Mesa County Inc; 1983-05-01 to 1998-01-04; source msha-controller-operator-history
- **operator_operates_mine:** Oldcastle SW Group, Inc. → CR 6; 1998-01-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → CR 6; 1998-01-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Oldcastle SW Group, Inc.; 1998-01-05 to current/open; source msha-controller-operator-history