# Relationship history for MSHA mine 0405694

Current hierarchy: **Mitchell  Brown → Porterville Rock and Recycle Inc → Decomposed Granite Pit (LG)**

- 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:** Mitchell  Brown → Decomposed Granite Pit (LG); 1997-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Porterville Rock and Recycle Inc → Decomposed Granite Pit (LG); 2006-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mitchell  Brown → Porterville Rock and Recycle Inc; 2006-09-01 to current/open; source msha-controller-operator-history