# Relationship history for MSHA mine 2902156

Current hierarchy: **Salt River Proj Agricultrl Improvmt & Power Dist → Salt River Proj Agricultrl Improvmt & Power Dist → Fence Lake 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:** Salt River Proj Agricultrl Improvmt & Power Dist → Fence Lake Mine; 1985-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Salt River Proj Agricultrl Improvmt & Power Dist → Fence Lake Mine; 1996-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Salt River Proj Agricultrl Improvmt & Power Dist → Salt River Proj Agricultrl Improvmt & Power Dist; 1996-04-01 to current/open; source msha-controller-operator-history