# Relationship history for MSHA mine 4001594

Current hierarchy: **Wright Harlan → M & W Coal Company → No 1 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

- **operator_operates_mine:** C S W Coal Company → No 1 Mine; 1974-04-30 to 1976-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Carroll Luther → No 1 Mine; 1974-04-30 to 1976-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Carroll Luther → C S W Coal Company; 1974-04-30 to 1976-03-31; source msha-controller-operator-history
- **operator_operates_mine:** M & W Coal Company → No 1 Mine; 1976-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Wright Harlan → No 1 Mine; 1976-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wright Harlan → M & W Coal Company; 1976-04-01 to current/open; source msha-controller-operator-history