# Relationship history for MSHA mine 0504628

Current hierarchy: **Edward E  Hockin; Charles E  MacArthur → Hockin Gravel LLC → Hockin Portable Crusher-Murphy 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Hockin Gravel LLC → Hockin Portable Crusher-Murphy Pit; 1998-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Charles E  MacArthur et al → Hockin Portable Crusher-Murphy Pit; 1998-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles E  MacArthur et al → Hockin Gravel LLC; 1998-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Edward E  Hockin et al → Hockin Gravel LLC; 1998-10-01 to current/open; source msha-controller-operator-history