# Relationship history for MSHA mine 2301277

Current hierarchy: **CRH PLC → Limpus Quarries Inc → K C METRO**

- 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

- **operator_operates_mine:** Alrok Quarries Ltd → K C METRO; 1950-01-01 to 1983-05-18; source msha-controller-operator-history
- **controller_controls_mine:** Kcor Inc  et al → K C METRO; 1950-01-01 to 1983-05-18; source msha-controller-operator-history
- **controller_controls_operator:** Kcor Inc  et al → Alrok Quarries Ltd; 1950-01-01 to 1983-05-18; source msha-controller-operator-history
- **operator_operates_mine:** Astro Quarries → K C METRO; 1983-05-19 to 1992-01-02; source msha-controller-operator-history
- **controller_controls_mine:** Paul L  Roberts → K C METRO; 1983-05-19 to 1992-01-02; source msha-controller-operator-history
- **controller_controls_operator:** Paul L  Roberts → Astro Quarries; 1983-05-19 to 1992-01-02; source msha-controller-operator-history
- **operator_operates_mine:** Metropolitan Quarries Inc → K C METRO; 1992-01-03 to 1996-08-06; source msha-controller-operator-history
- **controller_controls_mine:** Harlan L  Limpus et al → K C METRO; 1992-01-03 to 1996-08-06; source msha-controller-operator-history
- **controller_controls_operator:** Harlan L  Limpus et al → Metropolitan Quarries Inc; 1992-01-03 to 1996-08-06; source msha-controller-operator-history
- **operator_operates_mine:** Limpus Quarries Inc → K C METRO; 1996-08-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ashland Inc → K C METRO; 1996-08-07 to 2006-08-27; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc → Limpus Quarries Inc; 1996-08-07 to 2006-08-27; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → K C METRO; 2006-08-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Limpus Quarries Inc; 2006-08-28 to current/open; source msha-controller-operator-history