# Relationship history for MSHA mine 1202323

Current hierarchy: **Horizon Natural Resources Incorporated → Mining Technologies, Inc. → HWM Job #27-B**

- 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:** Horizon Natural Resources Incorporated → HWM Job #27-B; 1992-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mining Technologies, Inc. → HWM Job #27-B; 2002-01-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Horizon Natural Resources Incorporated → Mining Technologies, Inc.; 2002-01-24 to current/open; source msha-controller-operator-history