# Relationship history for MSHA mine 4602180

Current hierarchy: **Harden Ronald K → Old Mill Mining Inc → Auger No 2**

- 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:** Anderson & Anderson Contractors Inc → Auger No 2; 1950-01-01 to 1982-05-11; source msha-controller-operator-history
- **controller_controls_mine:** Anderson James W → Auger No 2; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Anderson James W → Anderson & Anderson Contractors Inc; 1950-01-01 to 1982-05-11; source msha-controller-operator-history
- **operator_operates_mine:** Old Mill Mining Inc → Auger No 2; 1982-05-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Harden Ronald K → Auger No 2; 1982-05-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harden Ronald K → Old Mill Mining Inc; 1982-05-12 to current/open; source msha-controller-operator-history