# Relationship history for MSHA mine 4104693

Current hierarchy: **CRH PLC → Austin Aggregates → Lampasas 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 → Lampasas Quarry; 1999-07-01 to 2006-08-27; source msha-controller-operator-history
- **controller_controls_mine:** MDU Resources Group Inc → Lampasas Quarry; 2005-10-10 to 2023-05-31; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Lampasas Quarry; 2006-08-28 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Knife River Corporation-South → Lampasas Quarry; 2007-10-11 to 2012-03-31; source msha-controller-operator-history
- **controller_controls_operator:** MDU Resources Group Inc → Knife River Corporation-South; 2007-10-11 to 2012-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Austin Aggregates → Lampasas Quarry; 2012-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc → Austin Aggregates; 2012-04-01 to 2006-08-27; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Austin Aggregates; 2012-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Knife River Corporation → Lampasas Quarry; 2023-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Knife River Corporation → Knife River Corporation-South; 2023-06-01 to 2012-03-31; source msha-controller-operator-history