# Relationship history for MSHA mine 3503868

Current hierarchy: **Schuyler L  Van Wart → Burl Brim Excavation → Roxy Ann**

- 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:** Burl Brim Excavation → Roxy Ann; 2018-07-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Burl John  Brim → Roxy Ann; 2018-07-18 to 2020-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Burl John  Brim → Burl Brim Excavation; 2018-07-18 to 2020-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Schuyler L  Van Wart → Roxy Ann; 2020-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Schuyler L  Van Wart → Burl Brim Excavation; 2020-04-01 to current/open; source msha-controller-operator-history