# Relationship history for MSHA mine 2301170

Current hierarchy: **CRH PLC → Hilty Quarries, Inc. → Eagle #2, Portable 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:** Ashland Inc → Eagle #2, Portable Plant; 1950-01-01 to 2006-08-27; source msha-controller-operator-history
- **controller_controls_mine:** Harlan L  Limpus et al → Eagle #2, Portable Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John  Hilty  et al → Eagle #2, Portable Plant; 1950-01-01 to 2009-11-03; source msha-controller-operator-history
- **operator_operates_mine:** A & M Quarries Inc → Eagle #2, Portable Plant; 1950-01-01 to 1984-04-25; source msha-controller-operator-history
- **controller_controls_mine:** George T  Ryberg → Eagle #2, Portable Plant; 1950-01-01 to 1984-04-25; source msha-controller-operator-history
- **controller_controls_operator:** George T  Ryberg → A & M Quarries Inc; 1950-01-01 to 1984-04-25; source msha-controller-operator-history
- **operator_operates_mine:** Limpus Quarries Inc → Eagle #2, Portable Plant; 1984-04-26 to 1996-08-06; source msha-controller-operator-history
- **controller_controls_operator:** Harlan L  Limpus et al → Limpus Quarries Inc; 1984-04-26 to 1996-08-06; source msha-controller-operator-history
- **operator_operates_mine:** Limpus Quarries Inc → Eagle #2, Portable Plant; 1996-08-07 to 2007-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Ashland Inc → Eagle #2, Portable Plant; 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 → Eagle #2, Portable Plant; 2006-08-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Limpus Quarries Inc; 2006-08-28 to 2007-12-31; source msha-controller-operator-history
- **operator_operates_mine:** APAC Kansas Inc → Eagle #2, Portable Plant; 2008-01-01 to 2012-04-17; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc → APAC Kansas Inc; 2008-01-01 to 2006-08-27; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → APAC Kansas Inc; 2008-01-01 to 2012-04-17; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Eagle #2, Portable Plant; 2009-11-04 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hilty Quarries, Inc. → Eagle #2, Portable Plant; 2012-04-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Hilty  et al → Hilty Quarries, Inc.; 2012-04-18 to 2009-11-03; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Hilty Quarries, Inc.; 2012-04-18 to current/open; source msha-controller-operator-history