# Relationship history for MSHA mine 1515502

Current hierarchy: **Sears Connie → Underground Management → 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Underground Management → No 1; 1986-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Sears Connie → No 1; 1986-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sears Connie → Underground Management; 1986-01-01 to current/open; source msha-controller-operator-history