# Relationship history for MSHA mine 1202357

Current hierarchy: **Justin R  Blackwell → BTI Crushed Stone Sales LLC → BTI Crushed Stone Sales 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** BTI Crushed Stone Sales Inc → BTI Crushed Stone Sales LLC; 2004-03-02 to 2007-06-06; source msha-controller-operator-history
- **controller_controls_mine:** Justin R  Blackwell → BTI Crushed Stone Sales LLC; 2004-03-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Justin R  Blackwell → BTI Crushed Stone Sales Inc; 2004-03-02 to 2007-06-06; source msha-controller-operator-history
- **operator_operates_mine:** BTI Crushed Stone Sales LLC → BTI Crushed Stone Sales LLC; 2007-06-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Justin R  Blackwell → BTI Crushed Stone Sales LLC; 2007-06-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Justin R  Blackwell → BTI Crushed Stone Sales LLC; 2007-06-07 to current/open; source msha-controller-operator-history