# Relationship history for MSHA mine 5001417

Current hierarchy: **David  Sjostedt → Eagle Contracting Incorporated → Portable Powerscreen / Pioneer Jaw**

- 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

- **controller_controls_mine:** State Of Alaska → Portable Powerscreen / Pioneer Jaw; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Alaska State Department Of Transportation → Portable Powerscreen / Pioneer Jaw; 1981-06-01 to 2012-07-04; source msha-controller-operator-history
- **controller_controls_operator:** State Of Alaska → Alaska State Department Of Transportation; 1981-06-01 to 2012-07-04; source msha-controller-operator-history
- **operator_operates_mine:** Eagle Contracting Incorporated → Portable Powerscreen / Pioneer Jaw; 2012-07-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** David  Sjostedt → Portable Powerscreen / Pioneer Jaw; 2012-07-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David  Sjostedt → Eagle Contracting Incorporated; 2012-07-05 to current/open; source msha-controller-operator-history