# Relationship history for MSHA mine 4201703

Current hierarchy: **Clark Oral C → Clark Mining Inc → Chum 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Clark Oral C → Chum Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sum Company Inc → Chum Mine; 1980-09-01 to 1981-03-08; source msha-controller-operator-history
- **controller_controls_mine:** Stocks Jerry & Crystal Day → Chum Mine; 1980-09-01 to 1981-03-08; source msha-controller-operator-history
- **controller_controls_operator:** Stocks Jerry & Crystal Day → Sum Company Inc; 1980-09-01 to 1981-03-08; source msha-controller-operator-history
- **operator_operates_mine:** Clark Mining Inc → Chum Mine; 1981-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Clark Oral C → Clark Mining Inc; 1981-03-09 to current/open; source msha-controller-operator-history