# Relationship history for MSHA mine 1401524

Current hierarchy: **CRH PLC → APAC-Kansas, Inc. → Shawnee 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:** Ashland Inc → Shawnee Quarry; 1950-01-01 to 2006-08-27; source msha-controller-operator-history
- **operator_operates_mine:** Shawnee Rock Company → Shawnee Quarry; 1989-04-01 to 2010-06-16; source msha-controller-operator-history
- **controller_controls_mine:** Deffenbaugh Holdings Group → Shawnee Quarry; 1989-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Deffenbaugh Holdings Group → Shawnee Rock Company; 1989-04-01 to 2010-06-16; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Shawnee Quarry; 2006-08-28 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** APAC-Kansas, Inc. → Shawnee Quarry; 2010-06-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc → APAC-Kansas, Inc.; 2010-06-17 to 2006-08-27; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → APAC-Kansas, Inc.; 2010-06-17 to current/open; source msha-controller-operator-history