# Relationship history for MSHA mine 3304554

Current hierarchy: **Rita  Alvis; James H  Alvis → Alvis Landscape and Golf Course Materials Inc → Ross Plant**

- 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

- **controller_controls_mine:** Rita  Alvis  et al → Ross Plant; 1992-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Stumin Sand & Gravel, Inc. → Ross Plant; 2005-10-29 to 2007-06-26; source msha-controller-operator-history
- **controller_controls_mine:** John J  Stumin → Ross Plant; 2005-10-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John J  Stumin → Stumin Sand & Gravel, Inc.; 2005-10-29 to 2007-06-26; source msha-controller-operator-history
- **operator_operates_mine:** Alvis Landscape and Golf Course Materials Inc → Ross Plant; 2007-06-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rita  Alvis  et al → Alvis Landscape and Golf Course Materials Inc; 2007-06-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James H  Alvis  et al → Alvis Landscape and Golf Course Materials Inc; 2007-06-27 to current/open; source msha-controller-operator-history