# Relationship history for MSHA mine 0103031

Current hierarchy: **Hollis Frank S → Andros Mining Company Inc → Three Forks 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:** Osborn Nicky Et Al → Three Forks Mine; 1986-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hollis Frank S → Three Forks Mine; 1994-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Osborn Coal Enterprises Inc → Three Forks Mine; 1994-11-01 to 1995-09-08; source msha-controller-operator-history
- **controller_controls_operator:** Osborn Nicky Et Al → Osborn Coal Enterprises Inc; 1994-11-01 to 1995-09-08; source msha-controller-operator-history
- **operator_operates_mine:** Andros Mining Company Inc → Three Forks Mine; 1995-09-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hollis Frank S → Andros Mining Company Inc; 1995-09-09 to current/open; source msha-controller-operator-history