# Relationship history for MSHA mine 2200815

Current hierarchy: **Robert L  Cooper → Mississippi Sand Solutions, LLC → MSS #1**

- 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:** Mississippi Sand Solutions, LLC → MSS #1; 2017-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert L  Cooper → MSS #1; 2017-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert L  Cooper → Mississippi Sand Solutions, LLC; 2017-04-01 to current/open; source msha-controller-operator-history