# Relationship history for MSHA mine 4503494

Current hierarchy: **Leslie L  Burns → Burns Construction Inc → BURNS CONSTRUCTION PORTABLE #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:** Leroy  Burns → BURNS CONSTRUCTION PORTABLE #1; 1993-08-01 to 2025-04-07; source msha-controller-operator-history
- **operator_operates_mine:** Burns Construction Inc → BURNS CONSTRUCTION PORTABLE #1; 2001-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Leroy  Burns → Burns Construction Inc; 2001-08-01 to 2025-04-07; source msha-controller-operator-history
- **controller_controls_mine:** Leslie L  Burns → BURNS CONSTRUCTION PORTABLE #1; 2025-04-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Leslie L  Burns → Burns Construction Inc; 2025-04-08 to current/open; source msha-controller-operator-history