# Relationship history for MSHA mine 3606361

Current hierarchy: **Horwath Louis E → Horwath & Sons Coal Company → Horwath & Son'S Coal Co**

- 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

- **operator_operates_mine:** Horwath & Sons Coal Company → Horwath & Son'S Coal Co; 1977-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Horwath Louis E Et Al → Horwath & Son'S Coal Co; 1977-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Horwath Louis E Et Al → Horwath & Sons Coal Company; 1977-03-01 to current/open; source msha-controller-operator-history