# Relationship history for MSHA mine 4202171

Current hierarchy: **Ted D Hone → Nebo Rock Products → NEBO ROCK PRODUCTS**

- 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:** Nebo Rock Products → NEBO ROCK PRODUCTS; 1997-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ted D Hone → NEBO ROCK PRODUCTS; 1997-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ted D Hone → Nebo Rock Products; 1997-04-01 to current/open; source msha-controller-operator-history