# Relationship history for MSHA mine 4202348

Current hierarchy: **CRH PLC → Staker & Parson Companies → Burdick 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:** John W  Burdick → Burdick Portable #3; 1987-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Burdick Paving → Burdick Portable #3; 2002-04-03 to 2009-12-31; source msha-controller-operator-history
- **controller_controls_operator:** John W  Burdick → Burdick Paving; 2002-04-03 to 2009-12-31; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Burdick Portable #3; 2002-05-30 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Staker & Parson Companies → Burdick Portable #3; 2010-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Staker & Parson Companies; 2010-01-01 to current/open; source msha-controller-operator-history