# Relationship history for MSHA mine 1515546

Current hierarchy: **Leroy  Lackey → Ball Branch Mining Inc → #2 Prep Plant**

- 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

- **controller_controls_mine:** Leroy  Lackey et al → #2 Prep Plant; 1984-11-30 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ball Branch Mining Inc → #2 Prep Plant; 1986-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Leroy  Lackey et al → Ball Branch Mining Inc; 1986-03-01 to current/open; source msha-controller-operator-history