# Relationship history for MSHA mine 1502041

Current hierarchy: **Howard Lewis → Leslie County Mining Company → No 6 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:** Kentucky Mountain Coal Company → No 6 Mine; 1950-01-01 to 1971-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Bnecker - Norris Ralkos Coal Corp → No 6 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bnecker - Norris Ralkos Coal Corp → Kentucky Mountain Coal Company; 1950-01-01 to 1971-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Leslie County Mining Company → No 6 Mine; 1972-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Howard Lewis → No 6 Mine; 1972-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Howard Lewis → Leslie County Mining Company; 1972-01-01 to current/open; source msha-controller-operator-history