# Relationship history for MSHA mine 4604353

Current hierarchy: **Riffle Kenneth H & Frank Smith → R & S Mining Company → Snake Den Mine**

- 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:** R & S Mining Company → Snake Den Mine; 1974-10-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Riffle Kenneth H & Frank Smith → Snake Den Mine; 1974-10-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Riffle Kenneth H & Frank Smith → R & S Mining Company; 1974-10-21 to current/open; source msha-controller-operator-history