# Relationship history for MSHA mine 1601442

Current hierarchy: **Margie F  Mixon; Larry M  Mixon → Rock & Roll Sand & Gravel, LLC → 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:** Rock & Roll Sand & Gravel, LLC → 1; 2006-08-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Larry M  Mixon et al → 1; 2006-08-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Larry M  Mixon et al → Rock & Roll Sand & Gravel, LLC; 2006-08-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Margie F  Mixon et al → Rock & Roll Sand & Gravel, LLC; 2006-08-25 to current/open; source msha-controller-operator-history