# Relationship history for MSHA mine 1601453

Current hierarchy: **Steven B  Simmons → Bogalusa Concrete Inc → Plant #1**

- 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:** Bass Sand & Gravel LLC → Plant #1; 2007-03-20 to 2009-10-14; source msha-controller-operator-history
- **controller_controls_mine:** James A  Simmons  et al → Plant #1; 2007-03-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James A  Simmons  et al → Bass Sand & Gravel LLC; 2007-03-20 to 2009-10-14; source msha-controller-operator-history
- **controller_controls_operator:** Reginald B  Bourne  et al → Bass Sand & Gravel LLC; 2007-03-20 to 2009-10-14; source msha-controller-operator-history
- **operator_operates_mine:** Bogalusa Concrete Inc → Plant #1; 2009-10-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Steven B  Simmons → Plant #1; 2009-10-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steven B  Simmons → Bogalusa Concrete Inc; 2009-10-15 to current/open; source msha-controller-operator-history