# Relationship history for MSHA mine 2902097

Current hierarchy: **CRH PLC → Oldcastle SW Group Inc → Bisti Wash 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

- **controller_controls_mine:** Stanley Kozimor Trust B"" → Bisti Wash Plant; 1950-01-01 to 2014-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Farmington Sand & Gravel → Bisti Wash Plant; 1992-05-01 to 2026-06-02; source msha-controller-operator-history
- **controller_controls_operator:** Stanley Kozimor Trust B"" → Farmington Sand & Gravel; 1992-05-01 to 2014-03-31; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Bisti Wash Plant; 1998-01-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stan  Kozimor et al → Bisti Wash Plant; 2014-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stan  Kozimor et al → Farmington Sand & Gravel; 2014-04-01 to 2026-06-02; source msha-controller-operator-history
- **controller_controls_operator:** Joe  Kozimor et al → Farmington Sand & Gravel; 2014-04-01 to 2026-06-02; source msha-controller-operator-history
- **operator_operates_mine:** Oldcastle SW Group Inc → Bisti Wash Plant; 2026-06-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Oldcastle SW Group Inc; 2026-06-03 to current/open; source msha-controller-operator-history