# Relationship history for MSHA mine 3601471

Current hierarchy: **Caola Joseph D → Red Dog Mining Inc → Hritz (Trent No 1) Mine**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Trent Robert D → Hritz (Trent No 1) Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hritz Coal Company → Hritz (Trent No 1) Mine; 1950-01-01 to 1974-07-15; source msha-controller-operator-history
- **controller_controls_mine:** Hritz Coal Company → Hritz (Trent No 1) Mine; 1950-01-01 to 1974-07-15; source msha-controller-operator-history
- **controller_controls_operator:** Hritz Coal Company → Hritz Coal Company; 1950-01-01 to 1974-07-15; source msha-controller-operator-history
- **operator_operates_mine:** Trent Coal Inc → Hritz (Trent No 1) Mine; 1974-07-16 to 1993-11-23; source msha-controller-operator-history
- **controller_controls_operator:** Trent Robert D → Trent Coal Inc; 1974-07-16 to 1993-11-23; source msha-controller-operator-history
- **operator_operates_mine:** Red Dog Mining Inc → Hritz (Trent No 1) Mine; 1993-11-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Caola Joseph D → Hritz (Trent No 1) Mine; 1993-11-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Caola Joseph D → Red Dog Mining Inc; 1993-11-24 to current/open; source msha-controller-operator-history