# Relationship history for MSHA mine 3900954

Current hierarchy: **City Of Sioux Falls → City Of Sioux Falls → Sioux Falls Gravel Pit**

- 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:** City Of Sioux Falls → Sioux Falls Gravel Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** City Of Sioux Falls → Sioux Falls Gravel Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** City Of Sioux Falls → City Of Sioux Falls; 1950-01-01 to current/open; source msha-controller-operator-history