# Relationship history for MSHA mine 0202146

Current hierarchy: **Salt River Pima-Maricopa Indian Community → Salt River Sand & Rock → Plant  #3**

- 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 → Plant  #3; 1981-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Baseline Materials & Custom Crushing → Plant  #3; 1983-04-01 to 1985-01-13; source msha-controller-operator-history
- **controller_controls_mine:** Hills Denver L → Plant  #3; 1983-04-01 to 1988-02-29; source msha-controller-operator-history
- **controller_controls_operator:** Hills Denver L → Baseline Materials & Custom Crushing; 1983-04-01 to 1985-01-13; source msha-controller-operator-history
- **operator_operates_mine:** Salt River Sand & Rock → Plant  #3; 1985-01-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Salt River Pima-Maricopa Indian Community → Salt River Sand & Rock; 1985-01-14 to current/open; source msha-controller-operator-history