# Relationship history for MSHA mine 2003014

Current hierarchy: **Mark E Nihranz → Superior Excavation & Crushing LLC → PIONEER 2**

- 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:** Superior Excavation & Crushing LLC → PIONEER 2; 1997-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mark E Nihranz et al → PIONEER 2; 1997-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mark E Nihranz et al → Superior Excavation & Crushing LLC; 1997-06-01 to current/open; source msha-controller-operator-history