# Relationship history for MSHA mine 4003485

Current hierarchy: **Marvin R  Walker Jr; Kathy W  Nicely → Walker's Truck Contractors, Inc. → Walker's Dirt 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

- **controller_controls_mine:** Marvin R  Walker Jr et al → Walker's Dirt Pit; 2008-05-12 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Walker's Truck Contractors, Inc. → Walker's Dirt Pit; 2018-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Marvin R  Walker Jr et al → Walker's Truck Contractors, Inc.; 2018-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kathy W  Nicely et al → Walker's Truck Contractors, Inc.; 2018-03-01 to current/open; source msha-controller-operator-history