# Relationship history for MSHA mine 3503069

Current hierarchy: **Smith Wendell → Klamath Brick & Tile Company → Burnt Creek Pit**

- 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:** Klamath Brick & Tile Company → Burnt Creek Pit; 1981-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Smith Wendell → Burnt Creek Pit; 1981-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Smith Wendell → Klamath Brick & Tile Company; 1981-06-01 to current/open; source msha-controller-operator-history