# Relationship history for MSHA mine 4503864

Current hierarchy: **Joelle L Buckman; Sarah Ellen Angelovich → SEA construction LLC → Screen Plant 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:** Joelle L Buckman et al → Screen Plant 1; 2023-04-27 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** SEA construction LLC → Screen Plant 1; 2026-06-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joelle L Buckman et al → SEA construction LLC; 2026-06-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sarah Ellen Angelovich et al → SEA construction LLC; 2026-06-14 to current/open; source msha-controller-operator-history