# Relationship history for MSHA mine 1517062

Current hierarchy: **Barry  Rogers → Ace Mining Company Inc → No 2 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

- **operator_operates_mine:** Little Valley Coal Company Inc → No 2 Mine; 1991-04-01 to 1995-02-09; source msha-controller-operator-history
- **controller_controls_mine:** Baker Ralph → No 2 Mine; 1991-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Baker Ralph → Little Valley Coal Company Inc; 1991-04-01 to 1995-02-09; source msha-controller-operator-history
- **controller_controls_mine:** Barry  Rogers → No 2 Mine; 1992-06-04 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ace Mining Company Inc → No 2 Mine; 1995-02-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Barry  Rogers → Ace Mining Company Inc; 1995-02-10 to current/open; source msha-controller-operator-history