# Relationship history for MSHA mine 1700740

Current hierarchy: **Dusty L  Haskell → HASKELL & SONS TRUCKING LLC → VIPER 120-PORTABLE #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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** HASKELL & SONS TRUCKING LLC → VIPER 120-PORTABLE #1; 2003-01-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dusty L  Haskell et al → VIPER 120-PORTABLE #1; 2003-01-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dusty L  Haskell et al → HASKELL & SONS TRUCKING LLC; 2003-01-07 to current/open; source msha-controller-operator-history