# Relationship history for MSHA mine 4003539

Current hierarchy: **Rogers Group Inc → Rogers Group Inc. → Delaney Loop Sand and Gravel**

- 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:** Rogers Group Inc → Delaney Loop Sand and Gravel; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Tomahawk Materials, Inc. → Delaney Loop Sand and Gravel; 2020-10-19 to 2024-05-21; source msha-controller-operator-history
- **controller_controls_mine:** Robert  Watkins et al → Delaney Loop Sand and Gravel; 2020-10-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Watkins et al → Tomahawk Materials, Inc.; 2020-10-19 to 2024-05-21; source msha-controller-operator-history
- **controller_controls_operator:** Linda  Tinker-Watkins et al → Tomahawk Materials, Inc.; 2020-10-19 to 2024-05-21; source msha-controller-operator-history
- **controller_controls_operator:** Jackie  Hamm et al → Tomahawk Materials, Inc.; 2020-10-19 to 2024-05-21; source msha-controller-operator-history
- **operator_operates_mine:** Rogers Group Inc. → Delaney Loop Sand and Gravel; 2024-05-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rogers Group Inc → Rogers Group Inc.; 2024-05-22 to current/open; source msha-controller-operator-history