# Relationship history for MSHA mine 1400068

Current hierarchy: **CRH PLC → Holliday Sand & Gravel Company, Inc. → Johnson County 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:** Deitz Hill Development Company → Johnson County Aggregates; 1950-01-01 to 1984-12-14; source msha-controller-operator-history
- **controller_controls_mine:** W E  Thomson Jr → Johnson County Aggregates; 1950-01-01 to 1985-02-22; source msha-controller-operator-history
- **controller_controls_operator:** W E  Thomson Jr → Deitz Hill Development Company; 1950-01-01 to 1984-12-14; source msha-controller-operator-history
- **operator_operates_mine:** Cedar Creek Quarries → Johnson County Aggregates; 1984-12-15 to 1992-01-01; source msha-controller-operator-history
- **controller_controls_mine:** Ronald H  Stanley → Johnson County Aggregates; 1984-12-15 to 1992-01-01; source msha-controller-operator-history
- **controller_controls_operator:** Ronald H  Stanley → Cedar Creek Quarries; 1984-12-15 to 1992-01-01; source msha-controller-operator-history
- **operator_operates_mine:** Johnson County Aggregates LLC → Johnson County Aggregates; 1992-01-02 to 2026-04-07; source msha-controller-operator-history
- **controller_controls_mine:** Ash Grove Cement Company et al → Johnson County Aggregates; 1992-01-02 to 2012-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Ash Grove Cement Company et al → Johnson County Aggregates LLC; 1992-01-02 to 2012-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Clarkson Construction Company et al → Johnson County Aggregates LLC; 1992-01-02 to 2012-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Ash Grove Cement Company → Johnson County Aggregates; 2008-08-01 to 2018-06-20; source msha-controller-operator-history
- **controller_controls_mine:** Ash Grove Cement Company → Johnson County Aggregates; 2012-06-01 to 2018-06-20; source msha-controller-operator-history
- **controller_controls_operator:** Ash Grove Cement Company → Johnson County Aggregates LLC; 2012-06-01 to 2018-06-20; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Johnson County Aggregates; 2018-06-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Johnson County Aggregates LLC; 2018-06-21 to 2026-04-07; source msha-controller-operator-history
- **operator_operates_mine:** Holliday Sand & Gravel Company, Inc. → Johnson County Aggregates; 2026-04-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ash Grove Cement Company → Holliday Sand & Gravel Company, Inc.; 2026-04-08 to 2018-06-20; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Holliday Sand & Gravel Company, Inc.; 2026-04-08 to current/open; source msha-controller-operator-history