# Relationship history for MSHA mine 1002035

Current hierarchy: **CRH PLC → Idaho Materials & Construction → Summit Stone Portable**

- 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:** Jerry W  Cox → Summit Stone Portable; 1992-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Summit Stone Portable; 2000-03-27 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Summit Stone Inc → Summit Stone Portable; 2003-02-01 to 2006-10-05; source msha-controller-operator-history
- **controller_controls_operator:** Jerry W  Cox → Summit Stone Inc; 2003-02-01 to 2006-10-05; source msha-controller-operator-history
- **operator_operates_mine:** Idaho Materials & Construction → Summit Stone Portable; 2006-10-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Idaho Materials & Construction; 2006-10-06 to current/open; source msha-controller-operator-history