# Relationship history for MSHA mine 0301808

Current hierarchy: **CRH PLC → Apac Tennessee Inc → APAC (BIRDEYE LOCATION)**

- 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:** Brad  De Vazier → APAC (BIRDEYE LOCATION); 1992-04-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ashland Inc → APAC (BIRDEYE LOCATION); 1996-10-01 to 2006-08-27; source msha-controller-operator-history
- **operator_operates_mine:** Crowley'S Ridge Sand & Gravel Company Inc → APAC (BIRDEYE LOCATION); 1999-06-01 to 1999-07-31; source msha-controller-operator-history
- **controller_controls_operator:** Brad  De Vazier → Crowley'S Ridge Sand & Gravel Company Inc; 1999-06-01 to 1999-07-31; source msha-controller-operator-history
- **operator_operates_mine:** Apac Tennessee Inc → APAC (BIRDEYE LOCATION); 1999-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc → Apac Tennessee Inc; 1999-08-01 to 2006-08-27; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → APAC (BIRDEYE LOCATION); 2006-08-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Apac Tennessee Inc; 2006-08-28 to current/open; source msha-controller-operator-history