# Relationship history for MSHA mine 2002802

Current hierarchy: **James L Porath → Porath Sand & Gravel → Aussie**

- 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:** James L Porath → Aussie; 1987-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Porath Sand & Gravel → Aussie; 1988-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James L Porath → Porath Sand & Gravel; 1988-04-01 to current/open; source msha-controller-operator-history