# Relationship history for MSHA mine 5001653

Current hierarchy: **Eklutna Incorporated → Eklutna Sand & Gravel → Rock Alaska**

- 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

- **operator_operates_mine:** Alaska Construction & Engineering Inc → Rock Alaska; 1999-07-01 to 2000-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Jerry M  Harman → Rock Alaska; 1999-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jerry M  Harman → Alaska Construction & Engineering Inc; 1999-07-01 to 2000-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Rock Alaska LLC → Rock Alaska; 2000-05-01 to 2019-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Monte  Doyle et al → Rock Alaska; 2000-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Monte  Doyle et al → Rock Alaska LLC; 2000-05-01 to 2019-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Ralph  Doyle et al → Rock Alaska LLC; 2000-05-01 to 2019-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Eklutna Incorporated → Rock Alaska; 2018-03-20 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Eklutna Sand & Gravel → Rock Alaska; 2020-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Eklutna Incorporated → Eklutna Sand & Gravel; 2020-01-01 to current/open; source msha-controller-operator-history