# Relationship history for MSHA mine 4407071

Current hierarchy: **Tim  Helton → Helton Grading Inc → Bar C Sand #1**

- 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:** Bar C Sand Inc → Bar C Sand #1; 2003-04-28 to 2025-04-13; source msha-controller-operator-history
- **controller_controls_mine:** Robyn A  Raines  et al → Bar C Sand #1; 2003-04-28 to 2022-11-13; source msha-controller-operator-history
- **controller_controls_operator:** Robyn A  Raines  et al → Bar C Sand Inc; 2003-04-28 to 2022-11-13; source msha-controller-operator-history
- **controller_controls_operator:** Robert H  Raines  et al → Bar C Sand Inc; 2003-04-28 to 2022-11-13; source msha-controller-operator-history
- **controller_controls_mine:** Robyn Allene Raines → Bar C Sand #1; 2022-11-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robyn Allene Raines → Bar C Sand Inc; 2022-11-14 to 2025-04-13; source msha-controller-operator-history
- **operator_operates_mine:** Helton Grading Inc → Bar C Sand #1; 2025-04-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tim  Helton → Bar C Sand #1; 2025-04-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tim  Helton → Helton Grading Inc; 2025-04-14 to current/open; source msha-controller-operator-history