# Relationship history for MSHA mine 4605785

Current hierarchy: **Cunningham Gene → Golden Bear Mining Company Inc → No 1 Surface 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:** Dever Dharl → No 1 Surface Mine; 1976-04-22 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Dever & Dever Excavating Inc → No 1 Surface Mine; 1978-05-01 to 1979-06-27; source msha-controller-operator-history
- **controller_controls_operator:** Dever Dharl → Dever & Dever Excavating Inc; 1978-05-01 to 1979-06-27; source msha-controller-operator-history
- **operator_operates_mine:** Golden Bear Mining Company Inc → No 1 Surface Mine; 1979-06-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cunningham Gene → No 1 Surface Mine; 1979-06-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cunningham Gene → Golden Bear Mining Company Inc; 1979-06-28 to current/open; source msha-controller-operator-history