# Relationship history for MSHA mine 4601785

Current hierarchy: **Ward Robert → Lucky Coal Company → Lucky No 4 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:** Ward Robert → Lucky No 4 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Gauley Coal Sales Company → Lucky No 4 Mine; 1950-01-01 to 1975-07-22; source msha-controller-operator-history
- **controller_controls_mine:** Gauley Coal Sales Co → Lucky No 4 Mine; 1950-01-01 to 1975-07-22; source msha-controller-operator-history
- **controller_controls_operator:** Gauley Coal Sales Co → Gauley Coal Sales Company; 1950-01-01 to 1975-07-22; source msha-controller-operator-history
- **operator_operates_mine:** Lucky Coal Company → Lucky No 4 Mine; 1975-07-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ward Robert → Lucky Coal Company; 1975-07-23 to current/open; source msha-controller-operator-history