# Relationship history for MSHA mine 4102621

Current hierarchy: **Horrice S → S Horrice Excavating Sand & Gravel → Seagoville 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:** S Horrice Excavating Sand & Gravel → Seagoville Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Horrice S → Seagoville Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Horrice S → S Horrice Excavating Sand & Gravel; 1950-01-01 to current/open; source msha-controller-operator-history