# Relationship history for MSHA mine 3400554

Current hierarchy: **CRH PLC → Holliday Sand & Gravel → Garnett Plant #15**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** List & Clark Construction Company → Garnett Plant #15; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lomon Sand & Gravel Company Inc → Garnett Plant #15; 1950-01-01 to 1992-07-19; source msha-controller-operator-history
- **controller_controls_mine:** C A  Lomon → Garnett Plant #15; 1950-01-01 to 1992-07-19; source msha-controller-operator-history
- **controller_controls_operator:** C A  Lomon → Lomon Sand & Gravel Company Inc; 1950-01-01 to 1992-07-19; source msha-controller-operator-history
- **operator_operates_mine:** Holliday Sand & Gravel Company, Inc. → Garnett Plant #15; 1992-07-20 to 2008-07-31; source msha-controller-operator-history
- **controller_controls_operator:** List & Clark Construction Company → Holliday Sand & Gravel Company, Inc.; 1992-07-20 to 2008-07-31; source msha-controller-operator-history
- **operator_operates_mine:** Holliday Sand & Gravel → Garnett Plant #15; 2008-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ash Grove Cement Company → Garnett Plant #15; 2008-08-01 to 2018-06-20; source msha-controller-operator-history
- **controller_controls_operator:** Ash Grove Cement Company → Holliday Sand & Gravel; 2008-08-01 to 2018-06-20; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Garnett Plant #15; 2018-06-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Holliday Sand & Gravel; 2018-06-21 to current/open; source msha-controller-operator-history