# Relationship history for MSHA mine 0103639

Current hierarchy: **Halston G Carter → Grayson Carter and Son Contracting, Inc. → Tuscumbia Quarry No. 3**

- 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:** Halston G Carter → Tuscumbia Quarry No. 3; 2024-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Grayson Carter and Son Contracting, Inc. → Tuscumbia Quarry No. 3; 2026-04-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Halston G Carter → Grayson Carter and Son Contracting, Inc.; 2026-04-27 to current/open; source msha-controller-operator-history