# Relationship history for MSHA mine 3606959

Current hierarchy: **Gulf + Western Industries Inc → Solar Fuel Company-A Gulf + Western Company → Solar #5a**

- 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:** Gulf + Western Industries Inc → Solar #5a; 1976-12-17 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Solar Fuel Company-A Gulf + Western Company → Solar #5a; 1980-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gulf + Western Industries Inc → Solar Fuel Company-A Gulf + Western Company; 1980-05-01 to current/open; source msha-controller-operator-history