# Relationship history for MSHA mine 2601401

Current hierarchy: **Spitler Robert → S S H K Inc → Egan Mill**

- 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:** Egan Milling Company Inc → Egan Mill; 1978-02-28 to 1980-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Erickson Einar C → Egan Mill; 1978-02-28 to 1980-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Erickson Einar C → Egan Milling Company Inc; 1978-02-28 to 1980-10-31; source msha-controller-operator-history
- **operator_operates_mine:** S S H K Inc → Egan Mill; 1980-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Spitler Robert → Egan Mill; 1980-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Spitler Robert → S S H K Inc; 1980-11-01 to current/open; source msha-controller-operator-history