# Relationship history for MSHA mine 5001688

Current hierarchy: **Eklutna Incorporated → Eklutna Sand & Gravel → Site 4 North Eagle River Gravel 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

- **controller_controls_mine:** Jerry M  Harman → Site 4 North Eagle River Gravel Pit; 1999-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Alaska Construction & Engineering Inc → Site 4 North Eagle River Gravel Pit; 2001-04-01 to 2018-03-19; source msha-controller-operator-history
- **controller_controls_operator:** Jerry M  Harman → Alaska Construction & Engineering Inc; 2001-04-01 to 2018-03-19; source msha-controller-operator-history
- **operator_operates_mine:** Eklutna Sand & Gravel → Site 4 North Eagle River Gravel Pit; 2018-03-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Eklutna Incorporated → Site 4 North Eagle River Gravel Pit; 2018-03-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Eklutna Incorporated → Eklutna Sand & Gravel; 2018-03-20 to current/open; source msha-controller-operator-history