# Relationship history for MSHA mine 3608700

Current hierarchy: **Fred D  Thebes → Fred D Thebes & Sons Inc → Fred D Thebes & Sons Inc**

- 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:** Fred D Thebes & Sons Inc → Fred D Thebes & Sons Inc; 1997-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Fred D  Thebes → Fred D Thebes & Sons Inc; 1997-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fred D  Thebes → Fred D Thebes & Sons Inc; 1997-10-01 to current/open; source msha-controller-operator-history