# Relationship history for MSHA mine 4801446

Current hierarchy: **D Scott  Sims → Sims Corp → Sims Corporation Screening 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** D Scott  Sims → Sims Corporation Screening Plant; 1985-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sims Corp → Sims Corporation Screening Plant; 1985-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** D Scott  Sims → Sims Corp; 1985-11-01 to current/open; source msha-controller-operator-history