# Relationship history for MSHA mine 4503691

Current hierarchy: **Byron T  Brown → Tim Brown Logging Inc. → Portable Crusher**

- 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

- **operator_operates_mine:** Tim Brown Logging Inc. → Portable Crusher; 2011-06-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Byron T  Brown → Portable Crusher; 2011-06-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Byron T  Brown → Tim Brown Logging Inc.; 2011-06-15 to current/open; source msha-controller-operator-history