# Relationship history for MSHA mine 3600023

Current hierarchy: **CRH PLC → Pennsy Supply Inc → East Petersburg 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Binkley & Ober Inc → East Petersburg Quarry; 1950-01-01 to 2007-09-17; source msha-controller-operator-history
- **controller_controls_mine:** Binkley & Ober Inc → East Petersburg Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Binkley & Ober Inc → Binkley & Ober Inc; 1950-01-01 to 2007-09-17; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → East Petersburg Quarry; 1993-07-21 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Pennsy Supply Inc → East Petersburg Quarry; 2007-09-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Pennsy Supply Inc; 2007-09-18 to current/open; source msha-controller-operator-history