# Relationship history for MSHA mine 4201794

Current hierarchy: **Standard Oil (Oh)-Sun Oil Co → White River Shale Oil Corp → White River Shale Project**

- 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:** White River Shale Oil Corp → White River Shale Project; 1982-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Standard Oil (Oh)-Sun Oil Co Et Al → White River Shale Project; 1982-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Standard Oil (Oh)-Sun Oil Co Et Al → White River Shale Oil Corp; 1982-08-01 to current/open; source msha-controller-operator-history