# Relationship history for MSHA mine 3003153

Current hierarchy: **Kristen  Klemenz → Krush-it gravel and aggregates llc → Erwin Aggregate Plant #10**

- 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

- **controller_controls_mine:** Daniel R  Hawbaker  et al → Erwin Aggregate Plant #10; 1983-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** A E Scudder Sand & Gravel L L C → Erwin Aggregate Plant #10; 1996-04-01 to 2001-03-18; source msha-controller-operator-history
- **controller_controls_mine:** Ambrose E  Scudder II → Erwin Aggregate Plant #10; 1996-04-01 to 2001-03-18; source msha-controller-operator-history
- **controller_controls_operator:** Ambrose E  Scudder II → A E Scudder Sand & Gravel L L C; 1996-04-01 to 2001-03-18; source msha-controller-operator-history
- **operator_operates_mine:** Glenn O Hawbaker Inc → Erwin Aggregate Plant #10; 2001-03-19 to 2026-07-26; source msha-controller-operator-history
- **controller_controls_operator:** Daniel R  Hawbaker  et al → Glenn O Hawbaker Inc; 2001-03-19 to 2026-07-26; source msha-controller-operator-history
- **operator_operates_mine:** Krush-it gravel and aggregates llc → Erwin Aggregate Plant #10; 2026-07-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kristen  Klemenz → Erwin Aggregate Plant #10; 2026-07-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kristen  Klemenz → Krush-it gravel and aggregates llc; 2026-07-27 to current/open; source msha-controller-operator-history