# Relationship history for MSHA mine 3607143

Current hierarchy: **Horan Richard & Raymond → H & H Coal Company → No 1 Slope**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Horan Richard & Raymond → No 1 Slope; 1978-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** H & H Coal Company → No 1 Slope; 1981-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Horan Richard & Raymond → H & H Coal Company; 1981-06-01 to current/open; source msha-controller-operator-history