# Relationship history for MSHA mine 1202149

Current hierarchy: **Eckenrode Norbert J → Tri-State Auger Mining Inc → Knox Auger #1**

- 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

- **controller_controls_mine:** Eckenrode Norbert J → Knox Auger #1; 1992-12-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Tri-State Auger Mining Inc → Knox Auger #1; 1993-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Eckenrode Norbert J → Tri-State Auger Mining Inc; 1993-12-01 to current/open; source msha-controller-operator-history