# Relationship history for MSHA mine 2000041

Current hierarchy: **CRH PLC → Michigan Paving and Materials Company → Ottawa Lake Quarry**

- 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:** Stoneco, Inc → Ottawa Lake Quarry; 1950-01-01 to 2003-06-15; source msha-controller-operator-history
- **controller_controls_mine:** Johnson S E Companies Inc → Ottawa Lake Quarry; 1950-01-01 to 2003-06-15; source msha-controller-operator-history
- **controller_controls_operator:** Johnson S E Companies Inc → Stoneco, Inc; 1950-01-01 to 2003-06-15; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Ottawa Lake Quarry; 1999-07-08 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Stoneco of Michigan → Ottawa Lake Quarry; 2003-06-16 to 2008-08-07; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Stoneco of Michigan; 2003-06-16 to 2008-08-07; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Ottawa Lake Quarry; 2003-06-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Stoneco, Inc; 2003-06-16 to 2003-06-15; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Ottawa Lake Quarry; 2005-08-19 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Michigan Paving and Materials Company → Ottawa Lake Quarry; 2008-08-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Michigan Paving and Materials Company; 2008-08-08 to current/open; source msha-controller-operator-history