# Relationship history for MSHA mine 4502316

Current hierarchy: **Trisha M Miller → Shold Excavating Inc dba Cotton Redi Mix → Cotton Pit & 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

- **operator_operates_mine:** Cotton Concrete Company → Cotton Pit & Plant; 1950-01-01 to 1981-01-31; source msha-controller-operator-history
- **controller_controls_mine:** G David  Cotton → Cotton Pit & Plant; 1950-01-01 to 1981-01-31; source msha-controller-operator-history
- **controller_controls_operator:** G David  Cotton → Cotton Concrete Company; 1950-01-01 to 1981-01-31; source msha-controller-operator-history
- **operator_operates_mine:** Shold Excavating Inc dba Cotton Redi Mix → Cotton Pit & Plant; 1981-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John T  Shold → Cotton Pit & Plant; 1981-02-01 to 2023-01-01; source msha-controller-operator-history
- **controller_controls_operator:** John T  Shold → Shold Excavating Inc dba Cotton Redi Mix; 1981-02-01 to 2023-01-01; source msha-controller-operator-history
- **controller_controls_mine:** Trisha M Miller → Cotton Pit & Plant; 2023-01-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Trisha M Miller → Shold Excavating Inc dba Cotton Redi Mix; 2023-01-02 to current/open; source msha-controller-operator-history