# Relationship history for MSHA mine 3101705

Current hierarchy: **Bryson Lyle → River Sand Company → High Shoals Dredge**

- 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:** River Sand Company → High Shoals Dredge; 1950-01-01 to 1982-08-27; source msha-controller-operator-history
- **controller_controls_mine:** Hoffman R B → High Shoals Dredge; 1950-01-01 to 1982-08-27; source msha-controller-operator-history
- **controller_controls_operator:** Hoffman R B → River Sand Company; 1950-01-01 to 1982-08-27; source msha-controller-operator-history
- **operator_operates_mine:** River Sand Company → High Shoals Dredge; 1982-08-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bryson Lyle → High Shoals Dredge; 1982-08-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bryson Lyle → River Sand Company; 1982-08-28 to current/open; source msha-controller-operator-history