# Relationship history for MSHA mine 0202528

Current hierarchy: **David K  Brimhall → Brimhall Sand Rock & Building Materials → Decker 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

- **operator_operates_mine:** Brimhall Sand Rock & Building Materials → Decker Pit; 1990-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** David K  Brimhall et al → Decker Pit; 2002-06-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David K  Brimhall et al → Brimhall Sand Rock & Building Materials; 2002-06-05 to current/open; source msha-controller-operator-history