# Relationship history for MSHA mine 4003182

Current hierarchy: **Ned P  Rich → Squirrel Mountain Stone → SQUIRREL MOUNTAIN STONE**

- 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:** Squirrel Mountain Stone → SQUIRREL MOUNTAIN STONE; 2001-11-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ned P  Rich → SQUIRREL MOUNTAIN STONE; 2001-11-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ned P  Rich → Squirrel Mountain Stone; 2001-11-19 to current/open; source msha-controller-operator-history