# Relationship history for MSHA mine 0301985

Current hierarchy: **Samuel M  Brockinton → SamSand LLC → SamSand 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:** Garland Sand and Gravel Corporation → SamSand LLC; 2009-06-22 to 2009-09-03; source msha-controller-operator-history
- **controller_controls_mine:** Sue  Farrar Parham → SamSand LLC; 2009-06-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sue  Farrar Parham → Garland Sand and Gravel Corporation; 2009-06-22 to 2009-09-03; source msha-controller-operator-history
- **operator_operates_mine:** SamSand LLC → SamSand LLC; 2009-09-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Chieftain Sand and Proppant LLC → SamSand LLC; 2009-09-04 to 2015-05-11; source msha-controller-operator-history
- **controller_controls_operator:** Chieftain Sand and Proppant LLC → SamSand LLC; 2009-09-04 to 2015-05-11; source msha-controller-operator-history
- **controller_controls_mine:** Samuel M  Brockinton → SamSand LLC; 2015-05-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Samuel M  Brockinton → SamSand LLC; 2015-05-12 to current/open; source msha-controller-operator-history