# Relationship history for MSHA mine 0102834

Current hierarchy: **Levoyde  Bradford → Bradford Sand & Gravel → POWELL-1**

- 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:** Levoyde  Bradford → POWELL-1; 1985-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bradford Sand & Gravel → POWELL-1; 1989-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Levoyde  Bradford → Bradford Sand & Gravel; 1989-11-01 to current/open; source msha-controller-operator-history