# Relationship history for MSHA mine 0102959

Current hierarchy: **CRH PLC → APAC-Southeast Inc Alabama Division → Sand Plant #131**

- 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 → Sand Plant #131; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lang Sand & Gravel Company Inc → Sand Plant #131; 1992-06-01 to 1995-04-17; source msha-controller-operator-history
- **controller_controls_mine:** Leon  Lang → Sand Plant #131; 1992-06-01 to 1995-04-17; source msha-controller-operator-history
- **controller_controls_operator:** Leon  Lang → Lang Sand & Gravel Company Inc; 1992-06-01 to 1995-04-17; source msha-controller-operator-history
- **operator_operates_mine:** Apac Alabama Inc → Sand Plant #131; 1995-04-18 to 2003-03-30; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc → Apac Alabama Inc; 1995-04-18 to 2003-03-30; source msha-controller-operator-history
- **operator_operates_mine:** APAC-Southeast Inc Alabama Division → Sand Plant #131; 2003-03-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ashland Inc → Sand Plant #131; 2003-03-31 to 2006-08-27; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc → APAC-Southeast Inc Alabama Division; 2003-03-31 to 2006-08-27; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Sand Plant #131; 2006-08-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → APAC-Southeast Inc Alabama Division; 2006-08-28 to current/open; source msha-controller-operator-history