# Relationship history for MSHA mine 2302117

Current hierarchy: **CRH PLC → Conco Quarries → Conco Quarries- Fair Play**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Ashland Inc → Conco Quarries- Fair Play; 1950-01-01 to 2006-08-27; source msha-controller-operator-history
- **controller_controls_mine:** Ash Grove Cement Company → Conco Quarries- Fair Play; 1950-01-01 to 2018-06-20; source msha-controller-operator-history
- **controller_controls_mine:** Tom  Ottendorf → Conco Quarries- Fair Play; 1979-09-13 to 1996-04-28; source msha-controller-operator-history
- **operator_operates_mine:** Ottendorf Stone Inc → Conco Quarries- Fair Play; 1995-05-01 to 1996-04-28; source msha-controller-operator-history
- **controller_controls_operator:** Tom  Ottendorf → Ottendorf Stone Inc; 1995-05-01 to 1996-04-28; source msha-controller-operator-history
- **operator_operates_mine:** T & M Stone Quarry Llc → Conco Quarries- Fair Play; 1996-04-29 to 2010-01-07; source msha-controller-operator-history
- **controller_controls_mine:** Wanda  Tarr et al → Conco Quarries- Fair Play; 1996-04-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wanda  Tarr et al → T & M Stone Quarry Llc; 1996-04-29 to 2010-01-07; source msha-controller-operator-history
- **controller_controls_operator:** Leroy  Tarr et al → T & M Stone Quarry Llc; 1996-04-29 to 2010-01-07; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Conco Quarries- Fair Play; 2006-08-28 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ash Grove Aggregates Inc → Conco Quarries- Fair Play; 2010-01-08 to 2020-06-23; source msha-controller-operator-history
- **controller_controls_operator:** Ash Grove Cement Company → Ash Grove Aggregates Inc; 2010-01-08 to 2018-06-20; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Conco Quarries- Fair Play; 2018-06-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Ash Grove Aggregates Inc; 2018-06-21 to 2020-06-23; source msha-controller-operator-history
- **operator_operates_mine:** Conco Quarries → Conco Quarries- Fair Play; 2020-06-24 to 2026-01-19; source msha-controller-operator-history
- **controller_controls_operator:** Ash Grove Cement Company → Conco Quarries; 2020-06-24 to 2018-06-20; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Conco Quarries; 2020-06-24 to 2026-01-19; source msha-controller-operator-history
- **operator_operates_mine:** Conco Quarries → Conco Quarries- Fair Play; 2026-01-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc → Conco Quarries; 2026-01-20 to 2006-08-27; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Conco Quarries; 2026-01-20 to current/open; source msha-controller-operator-history