# Relationship history for MSHA mine 1516990

Current hierarchy: **Ward David R → Ultra Coals Inc → No 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

- **operator_operates_mine:** Sunshine Mining Inc → No 1; 1990-10-01 to 1991-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Aaron  Justice Jr → No 1; 1990-10-01 to 1991-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Aaron  Justice Jr → Sunshine Mining Inc; 1990-10-01 to 1991-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Ultra Coals Inc → No 1; 1991-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ward David R → No 1; 1991-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ward David R → Ultra Coals Inc; 1991-10-01 to current/open; source msha-controller-operator-history