# Relationship history for MSHA mine 3901374

Current hierarchy: **Teigen George W → George W Teigen → Triple T**

- 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:** George W Teigen → Triple T; 1989-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Teigen George W → Triple T; 1989-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Teigen George W → George W Teigen; 1989-09-01 to current/open; source msha-controller-operator-history