# Relationship history for MSHA mine 1201545

Current hierarchy: **Sargent Bud L → B & L S Contracting Company → B & L S 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Sargent Bud L → B & L S No 1 Strip; 1975-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** B & L S Contracting Company → B & L S No 1 Strip; 1976-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sargent Bud L → B & L S Contracting Company; 1976-10-01 to current/open; source msha-controller-operator-history