# Relationship history for MSHA mine 1601598

Current hierarchy: **Marcus L Dyess → Superior Sand and Gravel → Plant 2**

- 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:** Marcus L Dyess → Plant 2; 2020-09-23 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Superior Sand and Gravel → Plant 2; 2021-03-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Marcus L Dyess → Superior Sand and Gravel; 2021-03-25 to current/open; source msha-controller-operator-history