# Relationship history for MSHA mine 2600347

Current hierarchy: **Tron  Huckaby → Huck Salt Company → Salt Flat**

- 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

- **operator_operates_mine:** Huck Salt Company → Salt Flat; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John R  Huckaby et al → Salt Flat; 1950-01-01 to 2026-04-14; source msha-controller-operator-history
- **controller_controls_operator:** John R  Huckaby et al → Huck Salt Company; 1950-01-01 to 2026-04-14; source msha-controller-operator-history
- **controller_controls_mine:** Tron  Huckaby → Salt Flat; 2026-04-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tron  Huckaby → Huck Salt Company; 2026-04-15 to current/open; source msha-controller-operator-history