# Relationship history for MSHA mine 4104124

Current hierarchy: **CRH PLC → APAC Texas, Inc. → Austin Aggregates 973 Plant**

- 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:** Wade  Shumaker → Austin Aggregates 973 Plant; 1983-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ashland Inc → Austin Aggregates 973 Plant; 1999-07-01 to 2006-08-27; source msha-controller-operator-history
- **operator_operates_mine:** Shumaker Enterprises Inc. → Austin Aggregates 973 Plant; 1999-12-01 to 2011-02-01; source msha-controller-operator-history
- **controller_controls_operator:** Wade  Shumaker → Shumaker Enterprises Inc.; 1999-12-01 to 2011-02-01; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Austin Aggregates 973 Plant; 2006-08-28 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** APAC Texas, Inc. → Austin Aggregates 973 Plant; 2011-02-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc → APAC Texas, Inc.; 2011-02-02 to 2006-08-27; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → APAC Texas, Inc.; 2011-02-02 to current/open; source msha-controller-operator-history