# Relationship history for MSHA mine 4608692

Current hierarchy: **Loudin Alice & Thomas → Barbour Enterprises Inc → Tonkin Job**

- 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:** Barbour Enterprize Inc → Tonkin Job; 1998-01-01 to 1998-07-20; source msha-controller-operator-history
- **controller_controls_mine:** Perrine Robert F → Tonkin Job; 1998-01-01 to 1998-07-20; source msha-controller-operator-history
- **controller_controls_operator:** Perrine Robert F → Barbour Enterprize Inc; 1998-01-01 to 1998-07-20; source msha-controller-operator-history
- **operator_operates_mine:** Barbour Enterprises Inc → Tonkin Job; 1998-07-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Loudin Alice & Thomas → Tonkin Job; 1998-07-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Loudin Alice & Thomas → Barbour Enterprises Inc; 1998-07-21 to current/open; source msha-controller-operator-history