# Relationship history for MSHA mine 4503832

Current hierarchy: **Aaron J Stafford → Stafford Excavating LLC → Portable Metso 96**

- 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:** Stafford Excavating LLC → Portable Metso 96; 2022-03-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Aaron J Stafford → Portable Metso 96; 2022-03-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Aaron J Stafford → Stafford Excavating LLC; 2022-03-31 to current/open; source msha-controller-operator-history