# Relationship history for MSHA mine 4608450

Current hierarchy: **Summers William D → Leah Coal Company Inc → Coalburg No A-5 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:** Summers William D → Coalburg No A-5 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Nicholas County Resources Inc → Coalburg No A-5 Mine; 1994-09-01 to 1995-06-06; source msha-controller-operator-history
- **controller_controls_mine:** Thomas M  Rasnake → Coalburg No A-5 Mine; 1994-09-01 to 1995-06-06; source msha-controller-operator-history
- **controller_controls_operator:** Thomas M  Rasnake → Nicholas County Resources Inc; 1994-09-01 to 1995-06-06; source msha-controller-operator-history
- **operator_operates_mine:** Leah Coal Company Inc → Coalburg No A-5 Mine; 1995-06-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Summers William D → Leah Coal Company Inc; 1995-06-07 to current/open; source msha-controller-operator-history