# Relationship history for MSHA mine 1519211

Current hierarchy: **Donald  Brockman → Tri-County Sand & Aggregate LLC → Tri-County Sand & Aggregate LLC**

- 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:** Tri-County Sand & Aggregate, LLC → Tri-County Sand & Aggregate LLC; 2008-05-08 to 2009-03-12; source msha-controller-operator-history
- **controller_controls_mine:** Donald  Brockman et al → Tri-County Sand & Aggregate LLC; 2008-05-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald  Brockman et al → Tri-County Sand & Aggregate, LLC; 2008-05-08 to 2009-03-12; source msha-controller-operator-history
- **operator_operates_mine:** Jacobs Energy LLC → Tri-County Sand & Aggregate LLC; 2009-03-13 to 2010-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Jeremy  Jacobs → Tri-County Sand & Aggregate LLC; 2009-03-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeremy  Jacobs → Jacobs Energy LLC; 2009-03-13 to 2010-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Tri-County Sand & Aggregate LLC → Tri-County Sand & Aggregate LLC; 2010-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald  Brockman et al → Tri-County Sand & Aggregate LLC; 2010-07-01 to current/open; source msha-controller-operator-history