# Relationship history for MSHA mine 3503570

Current hierarchy: **Roger  Wright; Ralph  Huffman → Huffman and Wright Logging Co → Huffman and Wright Logging Co**

- 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:** Huffman and Wright Logging Co → Huffman and Wright Logging Co; 2002-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ralph  Huffman et al → Huffman and Wright Logging Co; 2002-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ralph  Huffman et al → Huffman and Wright Logging Co; 2002-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roger  Wright et al → Huffman and Wright Logging Co; 2002-11-01 to current/open; source msha-controller-operator-history