# Relationship history for MSHA mine 3400564

Current hierarchy: **Shoffner Larry E → Shoffner Sand Of Oklahoma Inc → Spencer Pit (#1 Dredge And Plant)**

- 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

- **operator_operates_mine:** Shoffner Sand Of Oklahoma Inc → Spencer Pit (#1 Dredge And Plant); 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Shoffner Larry E → Spencer Pit (#1 Dredge And Plant); 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shoffner Larry E → Shoffner Sand Of Oklahoma Inc; 1950-01-01 to current/open; source msha-controller-operator-history