# Relationship history for MSHA mine 3401796

Current hierarchy: **Horn Joan → Horn Bros Rock & Chat → HORN #1**

- 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:** Horn Bros Rock & Chat → HORN #1; 1996-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Horn Joan → HORN #1; 1996-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Horn Joan → Horn Bros Rock & Chat; 1996-08-01 to current/open; source msha-controller-operator-history