# Relationship history for MSHA mine 4801615

Current hierarchy: **Fred W  Kunz → INTERMOUNTAIN EXCAVATION LLC → THOMAS 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** INTERMOUNTAIN EXCAVATION LLC → THOMAS PIT; 2002-02-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Fred W  Kunz  et al → THOMAS PIT; 2002-02-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fred W  Kunz  et al → INTERMOUNTAIN EXCAVATION LLC; 2002-02-27 to current/open; source msha-controller-operator-history