# Relationship history for MSHA mine 3003768

Current hierarchy: **William P  Boyle → Boyle Excavating Inc. → Basile Harpersfield**

- 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:** Boyle Excavating Inc. → Basile Harpersfield; 2010-06-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** William P  Boyle → Basile Harpersfield; 2010-06-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William P  Boyle → Boyle Excavating Inc.; 2010-06-30 to current/open; source msha-controller-operator-history