# Relationship history for MSHA mine 3800681

Current hierarchy: **CRH PLC → Bonsal American Inc → MARLBORO MINE**

- 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:** Bonsal W R Iii → MARLBORO MINE; 1950-01-01 to 2001-10-24; source msha-controller-operator-history
- **operator_operates_mine:** Bonsal American Inc → MARLBORO MINE; 1996-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bonsal W R Iii → Bonsal American Inc; 1996-04-01 to 2001-10-24; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → MARLBORO MINE; 2001-10-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Bonsal American Inc; 2001-10-25 to current/open; source msha-controller-operator-history