# Relationship history for MSHA mine 2001751

Current hierarchy: **CRH PLC → Stoneco of Michigan → Coldwater**

- 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:** Johnson S E Companies Inc → Coldwater; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Certified Transit Mix Inc → Coldwater; 1950-01-01 to 1999-05-26; source msha-controller-operator-history
- **controller_controls_mine:** Lee E  Brayton → Coldwater; 1950-01-01 to 1999-05-26; source msha-controller-operator-history
- **controller_controls_operator:** Lee E  Brayton → Certified Transit Mix Inc; 1950-01-01 to 1999-05-26; source msha-controller-operator-history
- **operator_operates_mine:** Wolcottville Sand & Gravel → Coldwater; 1999-05-27 to 2002-06-18; source msha-controller-operator-history
- **controller_controls_operator:** Johnson S E Companies Inc → Wolcottville Sand & Gravel; 1999-05-27 to 2002-06-18; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Coldwater; 1999-07-08 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Certified Sand and Gravel → Coldwater; 2002-06-19 to 2004-02-08; source msha-controller-operator-history
- **controller_controls_mine:** Johnson S E Companies Inc → Coldwater; 2002-06-19 to 2003-06-15; source msha-controller-operator-history
- **controller_controls_operator:** Johnson S E Companies Inc → Certified Sand and Gravel; 2002-06-19 to 2003-06-15; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Coldwater; 2003-06-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Certified Sand and Gravel; 2003-06-16 to 2004-02-08; source msha-controller-operator-history
- **operator_operates_mine:** Stoneco of Michigan → Coldwater; 2004-02-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Stoneco of Michigan; 2004-02-09 to current/open; source msha-controller-operator-history