# Relationship history for MSHA mine 1002142

Current hierarchy: **CRH PLC → H-K Contractors, Inc. → Portable Wash Plant  #1**

- 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:** Brent  Foster et al → Portable Wash Plant  #1; 1950-01-01 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Portable Wash Plant  #1; 2007-11-16 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** H-K Contractors, Inc. → Portable Wash Plant  #1; 2007-12-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brent  Foster et al → H-K Contractors, Inc.; 2007-12-12 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → H-K Contractors, Inc.; 2007-12-12 to current/open; source msha-controller-operator-history