# Relationship history for MSHA mine 4605474

Current hierarchy: **Nelson Phillip E & John Motto → Joshua Industries Inc → 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Wheeling-Pittsburgh Corp → No 1 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** W-P Coal Company → No 1 Mine; 1977-01-01 to 1981-06-25; source msha-controller-operator-history
- **controller_controls_operator:** Wheeling-Pittsburgh Corp → W-P Coal Company; 1977-01-01 to 1981-06-25; source msha-controller-operator-history
- **operator_operates_mine:** Joshua Industries Inc → No 1 Mine; 1981-06-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Nelson Phillip E & John Motto → No 1 Mine; 1981-06-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nelson Phillip E & John Motto → Joshua Industries Inc; 1981-06-26 to current/open; source msha-controller-operator-history