# Relationship history for MSHA mine 0202617

Current hierarchy: **Brown J Harry → Brown'S Rye Creek Enterprises → PORTABLE CRUSHING PLANT #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:** Brown'S Rye Creek Enterprises → PORTABLE CRUSHING PLANT #1; 1994-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Brown J Harry → PORTABLE CRUSHING PLANT #1; 1994-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brown J Harry → Brown'S Rye Creek Enterprises; 1994-02-01 to current/open; source msha-controller-operator-history