# Relationship history for MSHA mine 1000604

Current hierarchy: **CRH PLC → Idaho Materials & Construction → Federal Way Aggregates**

- 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

- **operator_operates_mine:** City Transfer Redimix Inc → Federal Way Aggregates; 1950-01-01 to 1999-08-25; source msha-controller-operator-history
- **controller_controls_mine:** Larry  Sawyer → Federal Way Aggregates; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Larry  Sawyer → City Transfer Redimix Inc; 1950-01-01 to 1999-08-25; source msha-controller-operator-history
- **operator_operates_mine:** City Transfer Redi-Mix → Federal Way Aggregates; 1999-08-26 to 2005-05-15; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Federal Way Aggregates; 1999-08-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → City Transfer Redi-Mix; 1999-08-26 to 2005-05-15; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Federal Way Aggregates; 2000-03-27 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Idaho Materials & Construction → Federal Way Aggregates; 2005-05-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Idaho Materials & Construction; 2005-05-16 to current/open; source msha-controller-operator-history