# Relationship history for MSHA mine 1517772

Current hierarchy: **Keith E  Thacker → Uvec Mining Inc → No 1**

- 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:** Appco Mining Inc → No 1; 1996-04-01 to 1997-02-27; source msha-controller-operator-history
- **controller_controls_mine:** Thacker Brian → No 1; 1996-04-01 to 1997-02-27; source msha-controller-operator-history
- **controller_controls_operator:** Thacker Brian → Appco Mining Inc; 1996-04-01 to 1997-02-27; source msha-controller-operator-history
- **operator_operates_mine:** Uvec Mining Inc → No 1; 1997-02-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Keith E  Thacker → No 1; 1997-02-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Keith E  Thacker → Uvec Mining Inc; 1997-02-28 to current/open; source msha-controller-operator-history