# Relationship history for MSHA mine 1302210

Current hierarchy: **CRH PLC → Rohlin Construction Company Inc → PORTABLE WASH PLANT #2**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Roy  Rohlin → PORTABLE WASH PLANT #2; 1950-01-01 to 2005-04-04; source msha-controller-operator-history
- **operator_operates_mine:** Rohlin Construction Company Inc → PORTABLE WASH PLANT #2; 1996-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roy  Rohlin → Rohlin Construction Company Inc; 1996-07-01 to 2005-04-04; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → PORTABLE WASH PLANT #2; 2005-04-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Rohlin Construction Company Inc; 2005-04-05 to current/open; source msha-controller-operator-history