# Relationship history for MSHA mine 1601500

Current hierarchy: **Bryan L  Bossier Sr → Diamond B Construction Co., LLC → Diamond B Drude Pit**

- 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:** Bryan L  Bossier Sr → Diamond B Drude Pit; 1993-08-13 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Diamond B Construction Co. LLC → Diamond B Drude Pit; 2010-01-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bryan L  Bossier Sr → Diamond B Construction Co. LLC; 2010-01-25 to current/open; source msha-controller-operator-history