# Relationship history for MSHA mine 1508036

Current hierarchy: **Storm Harold & William M Chandler → C B S Coal 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:** C B S Coal Company → No 1 Strip; 1975-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Storm Harold & William M Chandler → No 1 Strip; 1975-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Storm Harold & William M Chandler → C B S Coal Company; 1975-06-01 to current/open; source msha-controller-operator-history