# Relationship history for MSHA mine 4001088

Current hierarchy: **Texas Energy Petroleum Corp → Texas Energy Coal Company Inc → No 1 Tipple**

- 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:** Daugherty & Daugherty Construction Inc → No 1 Tipple; 1950-01-01 to 1981-05-20; source msha-controller-operator-history
- **controller_controls_mine:** Daugherty Thomas → No 1 Tipple; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Daugherty Thomas → Daugherty & Daugherty Construction Inc; 1950-01-01 to 1981-05-20; source msha-controller-operator-history
- **operator_operates_mine:** Texas Energy Coal Company Inc → No 1 Tipple; 1981-05-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Texas Energy Petroleum Corp → No 1 Tipple; 1981-05-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Texas Energy Petroleum Corp → Texas Energy Coal Company Inc; 1981-05-21 to current/open; source msha-controller-operator-history