# Relationship history for MSHA mine 0202834

Current hierarchy: **Salt River Pima-Maricopa Indian Community → Salt River Materials Group → WASH PLANT #9**

- 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 Pima-Maricopa Indian Community → WASH PLANT #9; 1981-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Salt River Materials Group → WASH PLANT #9; 1999-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Salt River Pima-Maricopa Indian Community → Salt River Materials Group; 1999-08-01 to current/open; source msha-controller-operator-history