# Relationship history for MSHA mine 2001765

Current hierarchy: **Thomas  Brink; Ross  Veltema → Top Grade Aggregates, LLC. → Top Grade Aggregates- Wexford Operation**

- 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:** Sargent Sand Company → Top Grade Aggregates- Wexford Operation; 1950-01-01 to 1995-12-11; source msha-controller-operator-history
- **controller_controls_mine:** Francesanna  Sargent → Top Grade Aggregates- Wexford Operation; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Francesanna  Sargent → Sargent Sand Company; 1950-01-01 to 1995-12-11; source msha-controller-operator-history
- **operator_operates_mine:** Sargent Sand Company → Top Grade Aggregates- Wexford Operation; 1995-12-12 to 1998-05-21; source msha-controller-operator-history
- **controller_controls_mine:** William B  Webber → Top Grade Aggregates- Wexford Operation; 1995-12-12 to 1998-05-21; source msha-controller-operator-history
- **controller_controls_operator:** William B  Webber → Sargent Sand Company; 1995-12-12 to 1998-05-21; source msha-controller-operator-history
- **operator_operates_mine:** Wexford Sand Company → Top Grade Aggregates- Wexford Operation; 1998-05-22 to 2026-07-20; source msha-controller-operator-history
- **controller_controls_mine:** Fairmount Santrol → Top Grade Aggregates- Wexford Operation; 1998-05-22 to 2018-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Fairmount Santrol → Wexford Sand Company; 1998-05-22 to 2018-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Thomas  Brink et al → Top Grade Aggregates- Wexford Operation; 2017-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** S C R-Sibelco Nv et al → Top Grade Aggregates- Wexford Operation; 2018-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** S C R-Sibelco Nv et al → Wexford Sand Company; 2018-06-01 to 2026-07-20; source msha-controller-operator-history
- **operator_operates_mine:** Top Grade Aggregates, LLC. → Top Grade Aggregates- Wexford Operation; 2026-07-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas  Brink et al → Top Grade Aggregates, LLC.; 2026-07-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ross  Veltema et al → Top Grade Aggregates, LLC.; 2026-07-21 to current/open; source msha-controller-operator-history