# Relationship history for MSHA mine 2003680

Current hierarchy: **Kevin D Spierling; Ernest D Spierling JR; Ernest M Spierling → Spierling Trucking & Excavating, Inc. → Robinson Road 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:** Spierling Trucking & Excavating, Inc. → Robinson Road Pit; 2024-08-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kevin D Spierling et al → Robinson Road Pit; 2024-08-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kevin D Spierling et al → Spierling Trucking & Excavating, Inc.; 2024-08-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ernest M Spierling et al → Spierling Trucking & Excavating, Inc.; 2024-08-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ernest D Spierling JR et al → Spierling Trucking & Excavating, Inc.; 2024-08-13 to current/open; source msha-controller-operator-history