# Relationship history for MSHA mine 1202417

Current hierarchy: **Justin R  Blackwell → Blackwell Limestone Products LLC → Blackwell Limestone Products 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

- **controller_controls_mine:** Justin R  Blackwell → Blackwell Limestone Products LLC; 2007-06-07 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** BTI Crushed Stone Sales LLC → Blackwell Limestone Products LLC; 2008-11-04 to 2013-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Justin R  Blackwell → BTI Crushed Stone Sales LLC; 2008-11-04 to 2013-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Blackwell Limestone Products LLC → Blackwell Limestone Products LLC; 2013-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Justin R  Blackwell → Blackwell Limestone Products LLC; 2013-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Justin R  Blackwell → Blackwell Limestone Products LLC; 2013-10-01 to current/open; source msha-controller-operator-history