# Relationship history for MSHA mine 0301930

Current hierarchy: **CRH PLC → APAC-Central, Inc. → North Custer 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 → North Custer Quarry; 1950-01-01 to 2006-08-27; source msha-controller-operator-history
- **operator_operates_mine:** Blake Construction Company Inc → North Custer Quarry; 2006-05-24 to 2007-12-09; source msha-controller-operator-history
- **controller_controls_mine:** Rodney  Blake → North Custer Quarry; 2006-05-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rodney  Blake → Blake Construction Company Inc; 2006-05-24 to 2007-12-09; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → North Custer Quarry; 2006-08-28 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sebastian County Sand & Gravel → North Custer Quarry; 2007-12-10 to 2010-12-22; source msha-controller-operator-history
- **controller_controls_mine:** Rodney  Blake → North Custer Quarry; 2007-12-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rodney  Blake → Sebastian County Sand & Gravel; 2007-12-10 to 2010-12-22; source msha-controller-operator-history
- **operator_operates_mine:** APAC-Central, Inc. → North Custer Quarry; 2010-12-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc → APAC-Central, Inc.; 2010-12-23 to 2006-08-27; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → APAC-Central, Inc.; 2010-12-23 to current/open; source msha-controller-operator-history