# Relationship history for MSHA mine 4609117

Current hierarchy: **David L  Huffman → Resources Limited, LLC → Clifftop Surface Mine No 1**

- 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:** David L  Huffman → Clifftop Surface Mine No 1; 2003-12-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cliff Resources LLC → Clifftop Surface Mine No 1; 2005-12-19 to 2006-12-18; source msha-controller-operator-history
- **controller_controls_mine:** Steven G  Park  et al → Clifftop Surface Mine No 1; 2005-12-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steven G  Park  et al → Cliff Resources LLC; 2005-12-19 to 2006-12-18; source msha-controller-operator-history
- **controller_controls_operator:** Peter D  Schreiber  et al → Cliff Resources LLC; 2005-12-19 to 2006-12-18; source msha-controller-operator-history
- **operator_operates_mine:** Resources Limited, LLC → Clifftop Surface Mine No 1; 2006-12-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David L  Huffman → Resources Limited, LLC; 2006-12-19 to current/open; source msha-controller-operator-history