# Relationship history for MSHA mine 3901537

Current hierarchy: **Thomas E  Luke → T.F. Luke & Sons Inc. → Portable #4**

- 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

- **controller_controls_mine:** Thomas F  Luke → Portable #4; 1950-01-01 to 2026-07-11; source msha-controller-operator-history
- **operator_operates_mine:** T.F. Luke & Sons Inc. → Portable #4; 2009-05-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas F  Luke → T.F. Luke & Sons Inc.; 2009-05-05 to 2026-07-11; source msha-controller-operator-history
- **controller_controls_mine:** Thomas E  Luke → Portable #4; 2026-07-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas E  Luke → T.F. Luke & Sons Inc.; 2026-07-12 to current/open; source msha-controller-operator-history