# Relationship history for MSHA mine 1103103

Current hierarchy: **William  Hillyer Sr → Hillyer Inc → Black Pit**

- 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:** Hillyer Inc → Black Pit; 2002-05-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** William  Hillyer Sr → Black Pit; 2002-05-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William  Hillyer Sr → Hillyer Inc; 2002-05-20 to current/open; source msha-controller-operator-history