# Relationship history for MSHA mine 1517257

Current hierarchy: **Horizon Natural Resources Incorporated → Addington Inc → Mti - Job #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:** Horizon Natural Resources Incorporated → Mti - Job #2; 1983-08-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Addington Inc → Mti - Job #2; 1992-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Horizon Natural Resources Incorporated → Addington Inc; 1992-07-01 to current/open; source msha-controller-operator-history