# Relationship history for MSHA mine 1513955

Current hierarchy: **Sanders Ronald → C B S S Mining Company → No 1 Surface 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:** Ed Clemons Enterprises → No 1 Surface Mine; 1983-02-01 to 1983-03-23; source msha-controller-operator-history
- **controller_controls_mine:** Clemons Ed → No 1 Surface Mine; 1983-02-01 to 1983-03-23; source msha-controller-operator-history
- **controller_controls_operator:** Clemons Ed → Ed Clemons Enterprises; 1983-02-01 to 1983-03-23; source msha-controller-operator-history
- **operator_operates_mine:** C B S S Mining Company → No 1 Surface Mine; 1983-03-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Sanders Ronald → No 1 Surface Mine; 1983-03-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sanders Ronald → C B S S Mining Company; 1983-03-24 to current/open; source msha-controller-operator-history