# Relationship history for MSHA mine 4202561

Current hierarchy: **CRH PLC → Reynolds Sand & Gravel → Portable #3**

- 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:** Robert B  Reynolds et al → Portable #3; 1998-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Portable #3; 2002-05-30 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Reynolds Sand & Gravel → Portable #3; 2010-11-01 to 2010-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Robert B  Reynolds et al → Reynolds Sand & Gravel; 2010-11-01 to 2010-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Gary R  Reynolds et al → Reynolds Sand & Gravel; 2010-11-01 to 2010-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Staker & Parson Companies → Portable #3; 2011-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Staker & Parson Companies; 2011-01-01 to current/open; source msha-controller-operator-history