# Relationship history for MSHA mine 4201608

Current hierarchy: **Deitz Ralph K → C & D Exploration Inc → Straight Creek 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Deitz Ralph K → Straight Creek Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Clark Oral C → Straight Creek Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Clark Mining Inc → Straight Creek Mine; 1979-01-01 to 1981-11-24; source msha-controller-operator-history
- **controller_controls_operator:** Clark Oral C → Clark Mining Inc; 1979-01-01 to 1981-11-24; source msha-controller-operator-history
- **operator_operates_mine:** C & D Exploration Inc → Straight Creek Mine; 1981-11-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Deitz Ralph K → C & D Exploration Inc; 1981-11-25 to current/open; source msha-controller-operator-history