# Relationship history for MSHA mine 2103384

Current hierarchy: **David P  Brooks → B & B Sand Inc → B & B Screen Plant**

- 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:** B & M Sand → B & B Screen Plant; 2003-08-20 to 2006-11-14; source msha-controller-operator-history
- **controller_controls_mine:** Joe E  Bigelow  et al → B & B Screen Plant; 2003-08-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joe E  Bigelow  et al → B & M Sand; 2003-08-20 to 2006-11-14; source msha-controller-operator-history
- **controller_controls_operator:** Robert B  More  et al → B & M Sand; 2003-08-20 to 2006-11-14; source msha-controller-operator-history
- **operator_operates_mine:** B & B Sand Inc → B & B Screen Plant; 2006-11-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** David P  Brooks → B & B Screen Plant; 2006-11-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David P  Brooks → B & B Sand Inc; 2006-11-15 to current/open; source msha-controller-operator-history