# Relationship history for MSHA mine 1513545

Current hierarchy: **Oliver William & William S → Oliver & Oliver Mining Company → No 1 Strip**

- 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:** Brandenburg Contracting → No 1 Strip; 1982-06-01 to 1982-11-07; source msha-controller-operator-history
- **controller_controls_mine:** Brandenburg Troy & Ronnie → No 1 Strip; 1982-06-01 to 1982-11-07; source msha-controller-operator-history
- **controller_controls_operator:** Brandenburg Troy & Ronnie → Brandenburg Contracting; 1982-06-01 to 1982-11-07; source msha-controller-operator-history
- **operator_operates_mine:** Oliver & Oliver Mining Company → No 1 Strip; 1982-11-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Oliver William & William S → No 1 Strip; 1982-11-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Oliver William & William S → Oliver & Oliver Mining Company; 1982-11-08 to current/open; source msha-controller-operator-history