# Relationship history for MSHA mine 4104182

Current hierarchy: **USS Holdings Inc → U.S. Silica Company → Tyler 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** USS Holdings Inc → Tyler Plant; 1996-03-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Wright Bros Specialty Sands → Tyler Plant; 2000-07-01 to 2007-06-04; source msha-controller-operator-history
- **controller_controls_mine:** Mark  Wright et al → Tyler Plant; 2000-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mark  Wright et al → Wright Bros Specialty Sands; 2000-07-01 to 2007-06-04; source msha-controller-operator-history
- **controller_controls_operator:** Scott  Wright et al → Wright Bros Specialty Sands; 2000-07-01 to 2007-06-04; source msha-controller-operator-history
- **operator_operates_mine:** NBR Sand, LLC → Tyler Plant; 2007-06-05 to 2019-05-16; source msha-controller-operator-history
- **controller_controls_mine:** New Birmingham Incorporated → Tyler Plant; 2007-06-05 to 2016-08-15; source msha-controller-operator-history
- **controller_controls_operator:** New Birmingham Incorporated → NBR Sand, LLC; 2007-06-05 to 2016-08-15; source msha-controller-operator-history
- **controller_controls_mine:** USS Holdings Inc → Tyler Plant; 2016-08-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** USS Holdings Inc → NBR Sand, LLC; 2016-08-16 to 2019-05-16; source msha-controller-operator-history
- **operator_operates_mine:** U.S. Silica Company → Tyler Plant; 2019-05-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** USS Holdings Inc → U.S. Silica Company; 2019-05-17 to current/open; source msha-controller-operator-history