# Relationship history for MSHA mine 1507362

Current hierarchy: **Riley & Sanders Coal Co → Riley & Sanders Coal Company → No 1 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

- **controller_controls_mine:** Ratliff James Delbert-Danny L & Donald E → No 1 Mine; 1974-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Regina Fuel Company → No 1 Mine; 1974-09-30 to 1974-11-27; source msha-controller-operator-history
- **controller_controls_operator:** Ratliff James Delbert-Danny L & Donald E → Regina Fuel Company; 1974-09-30 to 1974-11-27; source msha-controller-operator-history
- **operator_operates_mine:** Riley & Sanders Coal Company → No 1 Mine; 1974-11-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Riley & Sanders Coal Co → No 1 Mine; 1974-11-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Riley & Sanders Coal Co → Riley & Sanders Coal Company; 1974-11-28 to current/open; source msha-controller-operator-history