# Relationship history for MSHA mine 4605767

Current hierarchy: **Turpin Thomas W → T & P Construction Company Inc → Mathes Surface**

- 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

- **controller_controls_mine:** Turpin Thomas W → Mathes Surface; 1977-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** T & P Construction Company Inc → Mathes Surface; 1978-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Turpin Thomas W → T & P Construction Company Inc; 1978-04-01 to current/open; source msha-controller-operator-history