# Relationship history for MSHA mine 3503964

Current hierarchy: **Zachary Ryan Dahl; Kyle Michael Humphrys → Table Mountain Crushing, LLC → Portable 2**

- 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:** Zachary Ryan Dahl et al → Portable 2; 2023-05-08 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Table Mountain Crushing, LLC → Portable 2; 2024-07-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Zachary Ryan Dahl et al → Table Mountain Crushing, LLC; 2024-07-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kyle Michael Humphrys et al → Table Mountain Crushing, LLC; 2024-07-24 to current/open; source msha-controller-operator-history