# Relationship history for MSHA mine 3800617

Current hierarchy: **Sweat Richard F → Sweat'S Dirt Hauling Inc → Highway 642 Dirt Pit**

- 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:** Sweat'S Dirt Hauling Inc → Highway 642 Dirt Pit; 1986-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Sweat Richard F → Highway 642 Dirt Pit; 1986-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sweat Richard F → Sweat'S Dirt Hauling Inc; 1986-06-01 to current/open; source msha-controller-operator-history