# Relationship history for MSHA mine 4608439

Current hierarchy: **Milligan George → Continental Augering Inc → Continental Cb 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:** Milligan George → Continental Cb Mine; 1993-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Continental Augering Inc → Continental Cb Mine; 1994-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Milligan George → Continental Augering Inc; 1994-09-01 to current/open; source msha-controller-operator-history