# Relationship history for MSHA mine 2800026

Current hierarchy: **CRH PLC → Tilcon New York, Inc. → Mount Hope 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

- **operator_operates_mine:** Mt Hope Materials Corp → Mount Hope Quarry; 1950-01-01 to 1980-03-13; source msha-controller-operator-history
- **controller_controls_mine:** Mt Hope Materials Corp → Mount Hope Quarry; 1950-01-01 to 1980-03-13; source msha-controller-operator-history
- **controller_controls_operator:** Mt Hope Materials Corp → Mt Hope Materials Corp; 1950-01-01 to 1980-03-13; source msha-controller-operator-history
- **operator_operates_mine:** Mt Hope Rock Products Inc → Mount Hope Quarry; 1980-03-14 to 1987-11-23; source msha-controller-operator-history
- **controller_controls_mine:** Herbert  Hochreiter → Mount Hope Quarry; 1980-03-14 to 1987-11-23; source msha-controller-operator-history
- **controller_controls_operator:** Herbert  Hochreiter → Mt Hope Rock Products Inc; 1980-03-14 to 1987-11-23; source msha-controller-operator-history
- **operator_operates_mine:** Mt Hope Rock Products Inc → Mount Hope Quarry; 1987-11-24 to 2002-08-27; source msha-controller-operator-history
- **controller_controls_mine:** Carballal Robert E → Mount Hope Quarry; 1987-11-24 to 2001-04-26; source msha-controller-operator-history
- **controller_controls_operator:** Carballal Robert E → Mt Hope Rock Products Inc; 1987-11-24 to 2001-04-26; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Mount Hope Quarry; 1996-09-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Mount Hope Quarry; 2001-04-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Mt Hope Rock Products Inc; 2001-04-27 to 2002-08-27; source msha-controller-operator-history
- **operator_operates_mine:** Tilcon New York, Inc. → Mount Hope Quarry; 2002-08-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Tilcon New York, Inc.; 2002-08-28 to current/open; source msha-controller-operator-history