# Relationship history for MSHA mine 2002934

Current hierarchy: **CRH PLC → Michigan Paving and Materials Company → Denniston 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

- **controller_controls_mine:** Hanson PLC → Denniston Quarry; 1988-11-14 to 2007-08-22; source msha-controller-operator-history
- **operator_operates_mine:** Hanson Aggregates Midwest Inc → Denniston Quarry; 1994-06-01 to 2003-07-12; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Hanson Aggregates Midwest Inc; 1994-06-01 to 2003-07-12; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Denniston Quarry; 1999-07-08 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Stoneco of Michigan → Denniston Quarry; 2003-07-13 to 2008-08-07; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Stoneco of Michigan; 2003-07-13 to 2008-08-07; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Denniston Quarry; 2005-08-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → Denniston Quarry; 2007-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Hanson Aggregates Midwest Inc; 2007-08-23 to 2003-07-12; source msha-controller-operator-history
- **operator_operates_mine:** Michigan Paving and Materials Company → Denniston 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