# Relationship history for MSHA mine 3003458

Current hierarchy: **Ralph E  Porter → Porter's Sand & Gravel → Catatonk Pit**

- 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:** Ralph E  Porter → Catatonk Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Porter's Sand & Gravel → Catatonk Pit; 2003-10-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ralph E  Porter → Porter's Sand & Gravel; 2003-10-02 to current/open; source msha-controller-operator-history