# Relationship history for MSHA mine 4201793

Current hierarchy: **United States Government → U S Bureau Of Land Management → White River Oil Shale**

- 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:** United States Government → White River Oil Shale; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** White River Shale Oil Corp → White River Oil Shale; 1982-08-01 to 1986-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Standard Oil (Oh)-Sun Oil Co Et Al → White River Oil Shale; 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 1986-08-31; source msha-controller-operator-history
- **operator_operates_mine:** U S Bureau Of Land Management → White River Oil Shale; 1986-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** United States Government → U S Bureau Of Land Management; 1986-09-01 to current/open; source msha-controller-operator-history