# Relationship history for MSHA mine 2501124

Current hierarchy: **Steve  Barenberg → E.I.A. LLC → E.I.A. Sand & Gravel**

- 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:** Southfork Sand & Gravel Inc → E.I.A. Sand & Gravel; 1991-02-01 to 1997-07-15; source msha-controller-operator-history
- **controller_controls_mine:** Barenberg Walter S → E.I.A. Sand & Gravel; 1991-02-01 to 1997-07-15; source msha-controller-operator-history
- **controller_controls_operator:** Barenberg Walter S → Southfork Sand & Gravel Inc; 1991-02-01 to 1997-07-15; source msha-controller-operator-history
- **operator_operates_mine:** Dundy County → E.I.A. Sand & Gravel; 1997-07-16 to 2004-03-26; source msha-controller-operator-history
- **controller_controls_mine:** Dundy County-Ne → E.I.A. Sand & Gravel; 1997-07-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dundy County-Ne → Dundy County; 1997-07-16 to 2004-03-26; source msha-controller-operator-history
- **operator_operates_mine:** E.I.A. LLC → E.I.A. Sand & Gravel; 2004-03-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stacy  Barenberg et al → E.I.A. Sand & Gravel; 2004-03-27 to 2020-01-30; source msha-controller-operator-history
- **controller_controls_operator:** Stacy  Barenberg et al → E.I.A. LLC; 2004-03-27 to 2020-01-30; source msha-controller-operator-history
- **controller_controls_operator:** Steve  Barenberg et al → E.I.A. LLC; 2004-03-27 to 2020-01-30; source msha-controller-operator-history
- **controller_controls_mine:** Steve  Barenberg → E.I.A. Sand & Gravel; 2020-01-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steve  Barenberg → E.I.A. LLC; 2020-01-31 to current/open; source msha-controller-operator-history